no non – poly attire, id’s around your neck objective` review on work, energy, power and...
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NO NON – POLY ATTIRE, ID’s AROUND YOUR NECK
OBJECTIVE `Review on work, energy, power and momentum.
Drill 4.33: prep Date: 06-03-2015
Get a copy of Review Packet 3, go straight to your seat and start working with the review sheet.
EXTRA CREDIT - due on Monday, June 83 pts each packet COMPLETED review packet (no credit for incomplete/ with blanks reviewer)2 pts for being present and on time in class (1 pt if late) to EXAM SCORE
ZERO for the day behavior is unbecoming (ex. Loud, electronics, sleeping etc)
All LEGAL missed work/ quiz should be made-up by Fri, June 5. STAY SEATED, Wait for teacher to say “class
dismiss”
REVIEW PACKETSDue by 8:05 on Monday, June 8PLACE ALL THE
5 -PACKETS IN YOUR CLASS BINS
HOMEWORKEverything we CANNOT DO IN
CLASS
No HOMEWORK
If we can finish each packet in
class
MULTIPLE CHOICE Circle the letter of your answer
(equations for problem solving questions)
No. 1When a car’s speed doubles, what happens to its kinetic energy? It is quartered It is halved It is doubled It is quadrupled
No. 1When a car’s speed doubles, what happens to its kinetic energy?
It is quadrupled
No. 2Which energy transformation occurs as a book falls from the top of your book shelf?the book’s potential energy and kinetic energy
decreasesthe book’s potential energy increases and it’s
kinetic energy decreases the book’s potential energy decreases and it’s
kinetic energy increases the book’s potential energy and kinetic energy
increases
No. 2Which energy transformation occurs as a book falls from the top of your book shelf?
the book’s potential energy decreases and
it’s kinetic energy increases
No. 3The main difference between kinetic energy and potential energy is thatkinetic energy involves position and potential
energy involves motion. kinetic energy involves motion and potential
energy involves position. although both energies involve motion, only
kinetic involves position. although both energies involve position, only
potential involves motion.
No. 3The main difference between kinetic energy and potential energy is that
kinetic energy involves motion and potential
energy involves position.
No. 44 N is exerted on a 1 kg mass at rest for 2 m, causing it to move. What is the change in the object’s kinetic energy?2 J16 J8 J 64 J
No. 44 N is exerted on a 1 kg mass at rest for 2 m, causing it to move. What is the change in the object’s kinetic energy?
8 J
No. 5As the object moves from point A to point D across the surface, the sum of its gravitational potential and kinetic energies ____.decreases, onlydecreases then increasesincreases then decreasesremains the same
No. 5As the object moves from point A to point D across the surface, the sum of its gravitational potential and kinetic energies ____.
remains the same
No. 6The object will have a minimum potential energy at point ____.AB CDE
No. 6The object will have a minimum potential energy at point ____.
B
No. 7The object's kinetic energy at point C is greater than its kinetic energy at point ____.A onlyA, D and EB onlyD and E
No. 7The object's kinetic energy at point C is greater than its kinetic energy at point ____.
A, D and E
No. 8How fast would a 100-kg meteorite have to travel to have the same energy as a 10,000-kg meteorite traveling at 100 m/s? 500 m/s 5000 m/s1000 m/s 10,000 m/s
No. 8How fast would a 100-kg meteorite have to travel to have the same energy as a 10,000-kg meteorite traveling at 100 m/s?
No. 8How fast would a 100-kg meteorite have to travel to have the same energy as a 10,000-kg meteorite traveling at 100 m/s?
1000 m/s
No. 9The law of conservation of energy states that :in a closed, isolated system, the total amount of
energy is constantthe total amount of energy in any system is the
sum of its kinetic and gravitational potential energies
Energy can increase or decrease, it depends on the work done
the total amount of energy in any system is its mechanical energy
No. 9The law of conservation of energy states that :
in a closed, isolated system, the total
amount of energy is constant
No. 10The sum of the kinetic and gravitational potential energies of a system is calledReserved EnergyConserved EnergyMomentumMechanical Energy
No. 10The sum of the kinetic and gravitational potential energies of a system is called
Mechanical Energy
No. 11If the time of collision remains t, but the initial velocity is doubled, what happens to the force necessary to catch the ball?It doublesIt quadruples.It is cut in half It is cut to one fourth of the original
force
No. 11If the time of collision remains t, but the initial velocity is doubled, what happens to the force necessary to catch the ball?
It doubles
No. 12An impulse acts on an object when ______________ is applied __________A velocity, to a massa force, for a timeAcceleration, over a distancefriction, while it moves
No. 12An impulse acts on an object when ______________ is applied __________
a force, for a time
No. 13If a 32 Ns impulse is given to a 4 kg object, the change of momentum for the object is:4 kg m/s8 kg m/s32 kg m/s128 kg m/s•
No. 13If a 32 Ns impulse is given to a 4 kg object, the change of momentum for the object is:
32 kg m/s
No. 14In which of the following situations would a falling egg experience the LEAST amount of average force as it is stopped? an egg with a momentum of –0.2 kg · m/s stopping over
an interval of .05 s an egg with a momentum of –0.2 kg · m/s stopping over
an interval of 1.0 s an egg with a momentum of –0.2 kg · m/s stopping over
an interval of 2.0 s an egg with a momentum of –0.2 kg · m/s stopping over
an interval of 5.0 s
No. 14In which of the following situations would a falling egg experience the LEAST amount of average force as it is stopped?
an egg with a momentum of –0.2 kg · m/s stopping over an
interval of 5.0 s
No. 15Consider the mass and velocity values of Objects A and B on the right.• Compared to Object B, Object A has ____
momentum.two times the four times theeight times the the sameone-half the one-fourth the
No. 15Consider the mass and velocity values of Objects A and B on the right.• Compared to Object B, Object A has ____
momentum.
two times the
No. 16Which quantity has both a magnitude and a direction?EnergyPowerMomentumWork
No. 16Which quantity has both a magnitude and a direction?
Momentum
No. 17A 3.0 kilogram steel block is at rest on a frictionless horizontal surface. A 1.0 kg lump of clay is propelled horizontally at 6.0 meters per second toward the block as shown in the diagram below. Upon collision, the clay and steel block stick together and move to the right with a speed of:1.5m/s2.0 m/s3.0 m/s6.0 m/s
No. 17A 3.0 kilogram steel block is at rest on a frictionless horizontal surface. A 1.0 kg lump of clay is propelled horizontally at 6.0 meters per second toward the block as shown in the diagram below. Upon collision, the clay and steel block stick together and move to the right with a speed of:
No. 17A 3.0 kilogram steel block is at rest on a frictionless horizontal surface. A 1.0 kg lump of clay is propelled horizontally at 6.0 meters per second toward the block as shown in the diagram below. Upon collision, the clay and steel block stick together and move to the right with a speed of:
1.5m/s
No. 18Same as no. 12
No. 19SAME AS NO. 13
No. 20Object A with momentum of 80 kg m/s and object B with momentum 50 kg m/s collide. The total momentum of the system after the collision is 0 kg m/s30 kg m/s130 kg m/s400 kgm/scan’t be determined
No. 20Object A with momentum of 80 kg m/s and object B with momentum 50 kg m/s collide. The total momentum of the system after the collision is
130 kg m/s
No. 21What is the maximum height to which a motor having a power rating of 20.4 watts can lift a 5.00 kilogram stone in 10.0 seconds?0.416 m 0.408 m4.16 m40.8 m
No. 21What is the maximum height to which a motor having a power rating of 20.4 watts can lift a 5.00 kilogram stone in 10.0 seconds?
4.16 m
No. 22Object 1 and Object 2 are traveling at the same speed, but the kinetic energy of Object 1 is greater than the kinetic energy of Object 2. How does the weight of Object 1 compare to the weight of Object 2?Object 1 weighs more than Object 2.Object 1 weighs less than Object 2.Object 1 weighs the same as Object 2More information is needed to compare the
weights of the objects.
No. 22Object 1 and Object 2 are traveling at the same speed, but the kinetic energy of Object 1 is greater than the kinetic energy of Object 2. How does the weight of Object 1 compare to the weight of Object 2?
Object 1 weighs more than Object 2.
No. 23A pendulum is made from a 7.50-kilogram mass attached to a rope. The mass is initially at rest and is released from position A which is 1.5 meters higher than the lowest point in its swing. After being released the pendulum moves freely back and forth between positions A and B, as shown in the diagram on the right. What is the kinetic energy of the mass has when it is at its lowest point? [Neglect air resistance.] 11 J 94 J 110 J 920 J
No. 23A pendulum is made from a 7.50-kilogram mass attached to a rope. The mass is initially at rest and is released from position A which is 1.5 meters higher than the lowest point in its swing. After being released the pendulum moves freely back and forth between positions A and B, as shown in the diagram on the right. What is the kinetic energy of the mass has when it is at its lowest point? [Neglect air resistance.]
110 J
No. 12Two elevators, A and B, move at constant speeds. Elevator B moves with twice the speed of elevator A. Elevator B weighs twice as much as elevator A. Compared to the power needed to lift elevator A, the power needed to lift elevator B isthe sametwice as greathalf as greatfour times as great
No. 12Two elevators, A and B, move at constant speeds. Elevator B moves with twice the speed of elevator A. Elevator B weighs twice as much as elevator A. Compared to the power needed to lift elevator A, the power needed to lift elevator B is
four times as great
No. 25The graph below represents the relationship between gravitational force and mass for objects near the surface of Earth. What does the slope of this graph represent?universal gravitational constant, Gacceleration due to gravity, gmomentum of the objectweight of the object
No. 25The graph below represents the relationship between gravitational force and mass for objects near the surface of Earth. What does the slope of this graph represent?
No. 25The graph below represents the relationship between gravitational force and mass for objects near the surface of Earth. What does the slope of this graph represent?
acceleration due to gravity, g
No. 26When a satellite is a distance R from the center of Earth, the force due to gravity on the satellite is F. What is the force due to gravity on the satellite when its distance from the center of Earth is 3R? F/9 F/3 F9F
No. 26When a satellite is a distance R from the center of Earth, the force due to gravity on the satellite is F. What is the force due to gravity on the satellite when its distance from the center of Earth is 3R?
F/9
No. 27The gravitational force of attraction between two objects would be increased bydoubling the mass of both objects, only
doubling the distance between the objects, only
doubling the mass of both objects and doubling the distance between the objects
doubling the mass of one object and doubling the distance between the objects
No. 27The gravitational force of attraction between two objects would be increased by
doubling the mass of both objects,
only
No. 28A ball of mass M is caught by someone wearing a baseball glove. The ball is in contact with the glove for a time t; the initial velocity of the ball (just before the catcher touches it) is v0. If the time of the ball’s collision with the glove is doubled, what happens to the force necessary to catch the ball? It doubles It quadruples.It is cut in half.It is cut to one fourth of the original force.
No. 28A ball of mass M is caught by someone wearing a baseball glove. The ball is in contact with the glove for a time t; the initial velocity of the ball (just before the catcher touches it) is v0. If the time of the ball’s collision with the glove is doubled, what happens to the force necessary to catch the ball?
It is cut in half.
No. 29If the time of collision remains t, but the initial velocity is doubled, what happens to the force necessary to catch the ball?It doubles.It quadruples.It is cut in half.It is cut to one fourth of the original
force.•
No. 29If the time of collision remains t, but the initial velocity is doubled, what happens to the force necessary to catch the ball?
It doubles
No. 30During a collision, an 84-kilogram driver of a car moving at 24 m/s is brought to rest by an inflating air bag in 1.2 seconds. The magnitude of the force exerted on the driver by the air bag is approximately7.0 x 101N8.2 x 102N1.7 x 103 N 2.0 x 103 N
No. 30During a collision, an 84-kilogram driver of a car moving at 24 m/s is brought to rest by an inflating air bag in 1.2 seconds. The magnitude of the force exerted on the driver by the air bag is approximately
2.0 x 103 N
No. 31A rifle recoils from firing a bullet. Compared to the speed of the bullet, the speed of the rifle’s recoil is smaller. What could be the reason for this?The momentum of the rifle is unchanged.The rifle has lots more mass than the bullet.The force against the rifle is relatively smaller.The impulse on the rifle is less than the impulse
on the bullet
No. 31A rifle recoils from firing a bullet. Compared to the speed of the bullet, the speed of the rifle’s recoil is smaller. What could be the reason for this?
The rifle has lots more mass than the
bullet
No. 32A moving freight train car runs into an identical car at rest on the track. The cars couple together. How does the velocity of the combined cars after the collision compare to the velocity of the first car before the collision?one half as largetwice as largethe samezero
No. 32A moving freight train car runs into an identical car at rest on the track. The cars couple together. How does the velocity of the combined cars after the collision compare to the velocity of the first car before the collision?
one half as large
No. 33An electric motor lifts an elevator 14.0 m in 22.5 s by exerting an upward force of 1.75×104 N. What power does the motor produce in kilowatts?10.9 kW1.09 x 104 kW 2.45 x 104 kW2.45 kW
No. 33An electric motor lifts an elevator 14.0 m in 22.5 s by exerting an upward force of 1.75×104 N. What power does the motor produce in kilowatts?
1.09 x 104 kW
No. 34 A 2.0-kilogram cart moving due east at 6.0 meters per second collides with a 3.0-kilogram cart moving due west. The carts stick together and come to rest after the collision. What was the initial speed of the 3.0-kilogram cart? 1.0 m/s4.0 m/s6.0 m/s9.0 m/s
No. 34 A 2.0-kilogram cart moving due east at 6.0 meters per second collides with a 3.0-kilogram cart moving due west. The carts stick together and come to rest after the collision. What was the initial speed of the 3.0-kilogram cart?
4.0 m/s
No. 35What occurs when the string is cut and the carts move apart?The magnitude of the acceleration of cart A is one-
half the magnitude of the acceleration of cart B.The length of time that the force acts on cart A is
twice the length of time the force acts on cart B.The magnitude of the force exerted on cart A is one-
half the magnitude of the force exerted on cart B.The magnitude of the impulse applied to cart A is
twice the magnitude of the impulse applied to cart B
No. 35What occurs when the string is cut and the carts move apart?
1 kg2 kg
No. 35What occurs when the string is cut and the carts move apart?
The magnitude of the acceleration of cart A is one-
half the magnitude of the acceleration of cart B.
No. 36After the string is cut and the two carts move apart, the magnitude of which quantity is the same for both carts?Momentumvelocityinertiakinetic energy
No. 36After the string is cut and the two carts move apart, the magnitude of which quantity is the same for both carts?
Momentum
No. 37In the figure on the right, if the force exerted on the backpack is 20.0 N and the distance it acts over is 0.25 m, what is the work done?2.5 J 5 J40 J80 J
No. 37In the figure on the right, if the force exerted on the backpack is 20.0 N and the distance it acts over is 0.25 m, what is the work done?
5 J
No. 38One __________ is one joule of work done in one second.calorienewtonvoltwatt
No. 38One __________ is one joule of work done in one second.
newton
No. 39How much work does the force of gravity do on a 5.45-kg bowling ball that falls a distance of 0.755 m? 40.3 J71.2 J4.1 J262 J
No. 39How much work does the force of gravity do on a 5.45-kg bowling ball that falls a distance of 0.755 m?
40.3 J
No. 40The equation for calculating work when there is an angle between force and displacement is: W = Fd cos W = Flm W = FdW = F KE
No. 40The equation for calculating work when there is an angle between force and displacement is:
W = Fd cos
No. 41A go-cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200. kilograms. Friction between the track and wheels can provide a maximum of 1200 N of centripetal force to keep the go-cart from sliding off the track.
What is the maximum speed the 200-kilogram go-cart can travel without sliding off the track? 8.0 m/s 12 m/s 48 m/s 170 m/s
No. 41A go-cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200. kilograms. Friction between the track and wheels can provide a maximum of 1200 N of centripetal force to keep the go-cart from sliding off the track.
What is the maximum speed the 200-kilogram go-cart can travel without sliding off the track?
12 m/s
No. 42A go-cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200. kilograms. Friction between the track and wheels can provide a maximum of 1200 N of centripetal force to keep the go-cart from sliding off the track.
Which change would increase the maximum speed at which the go-cart could travel without sliding off this track? decrease the coefficient of friction between the go-cart and the
track decrease the radius of the track increase the radius of the track increase the mass of the go-cart
No. 42A go-cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200. kilograms. Friction between the track and wheels can provide a maximum of 1200 N of centripetal force to keep the go-cart from sliding off the track.
Which change would increase the maximum speed at which the go-cart could travel without sliding off this track?
increase the radius of the track
No. 43Refer to the graph on the right, what is the work done on the first 2 m?A. 5 JB. 10 JC. 20 JD. 0 J
No. 43Refer to the graph on the right, what is the work done on the first 2 m?
B. 10 J
No. 44In which of the following situations is NO WORK done on a book?carrying the book down the hall
picking up the bookdropping the book pushing the book across the desk
No. 44In which of the following situations is NO WORK done on a book?
carrying the book down the hall
No. 45Work is done on an object when a constant force is exerted on the object causing the object to be displacedopposite the direction of the forceperpendicular to the forceat an angle to the forcein the direction of the force
No. 45Work is done on an object when a constant force is exerted on the object causing the object to be displaced
in the direction of the
force
No. 42What angle between the force applied on an object and its displacement allows for maximum work done on an object?0o
45 o
70 o
90 o
No. 42What angle between the force applied on an object and its displacement allows for maximum work done on an object?
0o
No. 46The rate of doing work: Effortforcepowerenergy
No. 46The rate of doing work:
power
No. 47In the following diagram scaled vectors represent the momentum of each of two masses, A and B, sliding toward each other on a frictionless horizontal surface. Which scaled vector best represents the momentum of the system after the masses collide?
No. 47In the following diagram scaled vectors represent the momentum of each of two masses, A and B, sliding toward each other on a frictionless horizontal surface. Which scaled vector best represents the momentum of the system after the masses collide?
No. 48A force of 6.0 newtons changes the momentum of a moving object by 3.0 kilogram meters per second. How long did the net force act on the mass?1.0 s2.0 s0.25 s0.50 s
No. 48A force of 6.0 newtons changes the momentum of a moving object by 3.0 kilogram meters per second. How long did the net force act on the mass?
0.50 s
No. 49The work done in lifting an apple one meter near Earth's surface is approximately:0.01 J1 J100 J1000 J
No. 49The work done in lifting an apple one meter near Earth's surface is approximately:
1 J
No. 50The unit of power: NNm wkgm/s
No. 50The unit of power:
w
PROBLEM SOLVING
Write the equation, solve
it later.
No. 51A cyclist exerts a force of 15.0 N as he
rides a bike 251 m in 30.0 s. How much power does the cyclist
develop?
No. 52Haloke does 176 J of work lifting
himself 0.300 m. What is Haloke’s mass?
No. 53A 17.0 kg crate is to be pulled a distance of 20.0 m, requiring 1210 J of work to be
done. If the job is done by attaching a rope and puling with a force of 75.0 N, at
what angle is the rope held from the horizontal?
No. 54Consider your height, how much work
you do in holding a 7.00 kg sack of potatoes while waiting in line at the
grocery store for 3.00 minutes. What is the power developed?
No. 55Brutus, a champion weightlifter, raises 240.0 kg of weights a distance of 2.35 m How much work is done by Brutus lifting the weights?
How much work is done by Brutus holding the weights above his head?
Does Brutus do work if he lets go of the weights and they fall back to the ground?
If Brutus completes the lift in 2.50 s, how much power is developed?
No. 56A construction worker uses a block and tackle to lift 2400 N of lumber from the ground to a waiting helper on the second floor, 4.00 m above the ground. To do this, she applies a 250-N force on the rope of the block and tackle. She pulls 50.0 m of rope through the block and tackle before the load is lifted to the second floor. Based upon the information given, calculate the following for this block and tackle:work input work output
efficiency
No. 57A car of mass 1000 kg is at rest when a truck
of mass 3000 kg rear ends it with a velocity of +10 m/s. If the car has a velocity of +15 m/s after the collision, what is the velocity of the
truck after the collision?
No. 58How long does it take a 10 gram
bullet to pass through an apple if it experiences a force of -500 N and
slows by 2 m/s?
No. 59Determine the force of gravitational
attraction between the earth (m = 5.98 x 1024 kg) and a 70-kg physics student if the
student is standing at sea level, a distance of 6.38 x 106 m from earth's
center
No. 60A small fish is cruising along with a speed of 2
m/s when another fish, 3 times more massive, comes head on at 2 m/s and
swallows the smaller fish. What is the final speed of the larger fish?
No. 61A 4.00 kg rock is rolling 10.0 m/s.
Find its kinetic energy.
No. 62Calculate the potential energy of a 5.00 kg object sitting on a 3.00 m
ledge
No. 63A spring is stretched 0.200 m from
equilibrium. The force constant (k) of the spring is 2500.0 N/m. What is the
potential energy of the spring?
No. 62An object with a change of velocity of 2 m/s undergoing an impulse of 600
Ns, find the mass of that object?
No. 63How high up is a 3.00 kg object
that has 300.00 joules of energy
No. 64A 3.0 kg toy falls from a height of 10.0 m.
What is its potential energy at the top? Just before hitting the ground, what will be its kinetic energy? What was the work done on the toy as it fell? What is the speed of the toy just before it hits the ground?
No. 65How high will a 0.50 kg ball rise if
100.0 J of work is done it?
No. 66Kelli weighs 42.00 N and she is sitting on a
playground swing seat that hangs 0.400 m above the ground. Tom pulls the swing back and releases it the seat is 1.00 m above the ground. How fast is
Kelli moving when the swing passes through its lowest position?
HOMEWORKAnswer the rest of the questions!
WRAP UPNone
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