no non – poly attire, id’s around your neck objective` review on vectors, newton’s law and...
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NO NON – POLY ATTIRE, ID’s AROUND YOUR NECK
OBJECTIVE `Review on vectors, newton’s law and inclined planes.
Drill 4.34: prep Date: 06-04-2015
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. 1Static friction occurs when two objects are __________.moving against each otherrollingcollidingat rest
No. 1Static friction occurs when two objects are __________.
AT REST
No. 2Which type of force is perpendicular to a surface?Normal ForceGravitational ForceFriction ForceApplied Force
No. 2Which type of force is perpendicular to a surface?
Normal Force
No. 3A sled of mass 40.0 kg is pulled along flat, snow-covered ground. The static friction coefficient is 0.28.What force will be needed to start the sled moving?31 N110 N147 N392 N
No. 3A sled of mass 40.0 kg is pulled along flat, snow-covered ground. The static friction coefficient is 0.28.What force will be needed to start the sled moving?
110 N
No. 4Friction is a force and it is measured in units calledWeightmassNewtonkilogram
No. 4Friction is a force and it is measured in units called
Newton
No. 5What is the friction between a rolling object and the surface it rolled on called?Rolling frictionBair frictionsliding frictionstatic friction
No. 5What is the friction between a rolling object and the surface it rolled on called?
Rolling friction
No. 6Friction is force. How is friction caused?Two surfaces being pushed togethertwo surfaces are acting at a distance
from each otherTwo surfaces being pulled apartTwo surfaces are in contact with each
other
No. 6Friction is force. How is friction caused?
Two surfaces are in contact with each other
No. 7What is meant by air or water resistance It is the force of air or water squashing
an objectIt is the force of friction caused by air
or water on an objectIt is the push that air or water can give
an object so it goes fasterNone of the above
No. 7What is meant by air or water resistance
It is the force of friction caused by air or water on an object
No. 8In this image F1 is equal to 100 N and F2 is equal to 150 N. What is the net force?Fnet = 50 NFnet = 50 NFnet = 250 NFnet= 0N
No. 8In this image F1 is equal to 100 N and F2 is equal to 150 N. What is the net force?
Fnet = 50 N
No. 9An object is in equilibrium if the net force on the objectNegativeneutralpositivezero
No. 9An object is in equilibrium if the net force on the object
zero
No. 10If the net force acting on an object is zero, it isAt restmoving at constant velocityboth A & Bneither A or B
No. 10If the net force acting on an object is zero, it is
both A & B
No. 11Which of these is true?Weight can change when
acceleration due to gravity changes.Weight is a measure of inertiaMass is a forceWeight is the measure of the
amount of matter in an object.
No. 11Which of these is true?
Weight can change when acceleration due
to gravity changes.
No. 12When velocity is constant, net force is more than zeronet force is less than zeronet force is equal to zerothe object is accelerating
No. 12When velocity is constant,
net force is equal to zero
No. 13When Earth and the Moon are separated by a distance of 3.84 x 108 meters, the magnitude of the gravitational force of attraction between them is 2.0 x 1020 newtons. What would be the magnitude of the gravitational force if Earth and the Moon were separated by one-half this distance?5.0 x 1019 N2.0 x 1020 N4.0 x 1020 N8.0 x 1020 N
No. 13When Earth and the Moon are separated by a distance of 3.84 x 108 meters, the magnitude of the gravitational force of attraction between them is 2.0 x 1020 newtons. What would be the magnitude of the gravitational force if Earth and the Moon were separated by one-half this distance?
4.0 x 1020 N
No. 14In a frictionless surface, Ff = 0N, when you stop pushing an objectthe object will eventually stop moving
the object will accelerate, it’s velocity will increase
the object will continue to move at a constant velocity, zero acceleration
you need the normal force to answer this question
No. 14In a frictionless surface, Ff = 0N, when you stop pushing an object
the object will continue to move at a constant
velocity, zero acceleration
No. 15When the acceleration due to gravity is increase,FN stays the sameFN increasesFN decreasesFN depends on the applied force
No. 15When the acceleration due to gravity is increase,
FN increases
No. 16Which pair of quantities could be used to determine the coefficient of friction for granite on concrete?mass & speed of the block
mass and normal force on the blockfrictional force and speed of the blockfrictional force and normal force on the
block
No. 16Which pair of quantities could be used to determine the coefficient of friction for granite on concrete?
frictional force and normal force on the block
No. 17According to the laws of planetary motion, a planet must move fastest when it is ___________ the sunClosest tofarthest fromits average distance from the sunsummer in
No. 17According to the laws of planetary motion, a planet must move fastest when it is ___________ the sun
Closest to
No. 18The Law of Universal gravitation was formulated byCavendishEinsteinNewtonKepler
No. 18The Law of Universal gravitation was formulated by
Newton
No. 19On a circular race track with a radius of 2.25 km, a certain road car set a speed record of 450 km/hr. What was the car's centripetal acceleration?90.0 m/s2 inward200 m/s2 inward32.8 m/s2 inward6.94 m/s2 inward
No. 19On a circular race track with a radius of 2.25 km, a certain road car set a speed record of 450 km/hr. What was the car's centripetal acceleration?
No. 19On a circular race track with a radius of 2.25 km, a certain road car set a speed record of 450 km/hr. What was the car's centripetal acceleration?
6.94 m/s2 inward
No. 20How far does an object in uniform circular motion travel during one period?2rv2/rr2
2r/a
No. 20How far does an object in uniform circular motion travel during one period?
2r
No. 21An object in circular motion has an acceleration that is In a direction tangential to the
circleaway from the center of the circleToward the center of the circle zero
No. 21An object in circular motion has an acceleration that is
Toward the center of the circle
No. 22The velocity vector for an object in uniform circular motion isDirected away from the center of the
circletangential to the circleDirected toward the center of the circle
proportional to the radius of the circle
No. 22The velocity vector for an object in uniform circular motion is
tangential to the circle
No. 23Which one of the following statements about circular motion is correct?The speed is changing all the timeThe linear speed is constant but the acceleration
is changing all the timeThe linear speed is constant and the velocity is
constantThe linear speed is constant but there is
acceleration because the velocity is changing all the time, since there is a constant change in direction
No. 23Which one of the following statements about circular motion is correct?
The linear speed is constant but there is acceleration because the velocity is changing all the time, since there is a constant change in direction
No. 24A model aeroplane is tethered to a post and held by a fine line. It flies in a horizontal circle. Then the line breaks. What direction will it fly in?Directly to the centre of the circleDirectly away from the centre of the circleIn a circular path, as before In a straight line
No. 24A model aeroplane is tethered to a post and held by a fine line. It flies in a horizontal circle. Then the line breaks. What direction
will it fly in? In a straight line
No. 25Calculate the speed of a 0.5 kg object that spins at the end of a 1.0 m length of yarn with a tension of 10 N.4.5 m/s4.9 m/s20 m/s 0.22 m/s
No. 25Calculate the speed of a 0.5 kg object that spins at the end of a 1.0 m length of yarn with a tension of 10 N.
4.5 m/s
No. 26The object shown in the diagram moves in uniform circular motion. Which arrow best depicts the net force acting on the object at the instant shown?DCBA
No. 26The object shown in the diagram moves in uniform circular motion. Which arrow best depicts the net force acting on the object at the instant shown?
A
No. 27A satellite is in orbit. This is becauseThere is no gravity
The satellite is being held there by centrifugal force
Gravity is acting as a centripetal forceIt is being attracted by the gravity of
other objects in space
No. 27A satellite is in orbit. This is because
Gravity is acting as a centripetal force
No. 28Which of the following is NOT a function of a machineIncrease the distance of the forcekeep the direction of forceIncrease the speed of a forcetransfer force from one place to
another
No. 28Which of the following is NOT a function of a machine
keep the direction of force
No. 29What form of energy is considered as waste energy due to frictionLight energyheat energysound energymechanical energy
No. 29What form of energy is considered as waste energy due to friction
heat energy
No. 30Which is a unit for IMAWattsJoulepercentnone
Ideal
Mechanical
Advantage
No. 30Which is a unit for IMA
none
No. 31Which of the following statement is TRUEA machine can create energyA machine can eases the load by changing
only the direction of a forceWork is the use of mechanical means to
transfer energyIn a real machine, the input work is equal to
the output work
No. 31Which of the following statement is TRUE
Work is the use of mechanical means to
transfer energy
No. 32Which is an example of a wedge?Rampchiselscrewcrowbar
No. 32Which is an example of a wedge?
chisel
No. 33Which of the following items is not an example of a simple machine?A crowbara bicyclea knifea wheelchair ramp
No. 33Which of the following items is not an example of a simple machine?
a bicycle
No. 34The IMA of a simple machine equals the Amount of output forceproduct of distances movedAmount of work done
ratio of distances moved
No. 34The IMA of a simple machine equals the
ratio of distances moved
No. 35The turning point of a leverFulcrumpivotturning pointcenter
No. 35The turning point of a lever
Fulcrum
No. 36What is the force exerted by the load being lifted called?Strong forceeffort forceresistance forceactual force
No. 36What is the force exerted by the load being lifted called?
RESISTANCE force
No. 37What is the IMA of a machine wherein the effort force moves a distance of 10 m and the resistance force through a distance of 9 m.0.990 1.1110
No. 37What is the IMA of a machine wherein the effort force moves a distance of 10 m and the resistance force through a distance of 9 m.
1.1
No. 38Decreasing the slant of an inclined plane increases its.Mechanical AdvantagePowerEffort ForceWork Output
No. 38Decreasing the slant of an inclined plane increases its.
Mechanical Advantage
No. 39A 26.0 kg block slides down a frictionless ramp that is 5.00 meters tall and 13.0 meters long as shown in the diagram below.
At what rate does it accelerate?It does not accelerateAt a rate equal to 5/12 of free fall acceleration
(4.08 m/s2)At a rate equal to 5/13 of free fall acceleration
(3.77 m/s2)At a rate equal to12/13 of free fall acceleration
(9.05 m/s2)
No. 39A 26.0 kg block slides down a frictionless ramp that is 5.00 meters tall and 13.0 meters long as shown in the diagram below.
At what rate does it accelerate?
No. 39A 26.0 kg block slides down a frictionless ramp that is 5.00 meters tall and 13.0 meters long as shown in the diagram below.
At what rate does it accelerate?
At a rate equal to 5/13 of free fall acceleration (3.77 m/s2)
No. 40A 26.0 kg block slides down a frictionless ramp that is 5.00 meters tall and 13.0 meters long as shown in the diagram below. How large is the normal force?Equal to the weight of the block (255 N)Equal to 5/12 of the weight of the block (102 N)Equal to 5/13 of the weight of the block (94.2 N)Equal to 12/13 of the weight of the block (226 N)
No. 40A 26.0 kg block slides down a frictionless ramp that is 5.00 meters tall and 13.0 meters long as shown in the diagram below. How large is the normal force?
No. 40A 26.0 kg block slides down a frictionless ramp that is 5.00 meters tall and 13.0 meters long as shown in the diagram below. How large is the normal force?
Equal to 12/13 of the weight of the block (235 N)
No. 41The diagram below shows an object moving counterclockwise around a horizontal, circular track.
• Which diagram represents the direction of both the object’s velocity (v) and the centripetal force (Fc) acting on the object when it is in the position shown?
No. 41The diagram below shows an object moving counterclockwise around a horizontal, circular track.
• Which diagram represents the direction of both the object’s velocity (v) and the centripetal force (Fc) acting on the object when it is in the position shown?
No. 42Forces that act on an object only by touching itInerttactilecontactfield
No. 42Forces that act on an object only by touching it
contact
No. 43A contact force that acts to oppose sliding motion between surfacesNormalweightAppliedFriction
No. 43A contact force that acts to oppose sliding motion between surfaces
Friction
No. 44On earth, a scale shows that you weigh 490 N, what is your mass?22 kg50 kg75 kg 100 kg
No. 44On earth, a scale shows that you weigh 490 N, what is your mass?
50 kg
No. 45A 475 N trunk is resting on a plane inclined 40.0o above the horizontal. Find the components of the weight force parallel and perpendicular to the planeFgx = 305 N, Fgy = 364 NFgx = -305 N, Fgy = -364 NFgx = 364 N, Fgy = 305 NFgx = -364 N, Fgy = -305 N
No. 45A 475 N trunk is resting on a plane inclined 40.0o above the horizontal. Find the components of the weight force parallel and perpendicular to the plane
No. 45A 475 N trunk is resting on a plane inclined 40.0o above the horizontal. Find the components of the weight force parallel and perpendicular to the plane
Fgx = -305 N,
Fgy = -364 NNegative because Fgx is going to the left/ down the plane, and Fgy is directed downward
No. 46The 475 N trunk is sliding down a plane inclined 40o above the horizontal. Which of the following is TRUE?Ff = Fll
Ff > Fll
Ff < Fll
not enough information
No. 46The 475 N trunk is sliding down a plane inclined 40o above the horizontal. Which of the following is TRUE?
Ff < Fll
No. 47A 145 kg man and a 45 kg boy is sliding down a hill that is inclined 45o from the horizontal. If they slide down at the same time, who will reach the bottom of the hill first?The 145 kg manThe 45 kg boyThey’ll reach the bottom at the same timeNot enough information to answer the
problem
No. 47A 145 kg man and a 45 kg boy is sliding down a hill that is inclined 45o from the horizontal. If they slide down at the same time, who will reach the bottom of the hill first?
They’ll reach the bottom at the same time
No. 48A 6 kg box is lying flat on a table. The normal force of the table on the box will beFN = Fg FN = F//
FN = Fgy
FN = Fgx
No. 48A 6 kg box is lying flat on a table. The normal force of the table on the box will be
FN = Fg
No. 49A skier has mass 45 kg and the slope is at 35°, what is the component of the skier's weight perpendicular to the slope?550 N250 N360 N not enough information
No. 49A skier has mass 45 kg and the slope is at 35°, what is the component of the skier's weight perpendicular to the slope?
No. 49A skier has mass 45 kg and the slope is at 35°, what is the component of the skier's weight perpendicular to the slope?
360 N
No. 50Which of the following statements is NOT true?Having an acceleration of 0 m/s/s does not
mean the object is at rest.The Fnet will be expressed as the force in the
direction of the acceleration minus any that oppose it.
The force of gravity is also known as weighThe force of gravity acts in a direction
perpendicular to the surface
No. 50Which of the following statements is NOT true?
The force of gravity acts in a direction perpendicular to the surface
PROBLEM SOLVING
Write the equation, solve
it later.
No. 51A sofa is at rest on the floor. The
mass of the sofa is 150.0 kg and the coefficient of static friction between
the sofa and the floor is 0.30. What is the maximum force of static friction?
No. 52If you use a horizontal force of 30.0 N to
slide a 12.0 kg wooden crate across a floor at a constant velocity, what is the
coefficient of kinetic friction between the crate and the floor?
No. 53A construction worker uses a pulley system called 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: Mechanical Advantage
work input
work output
efficiency
No. 53 eExplain why the work performed by the machine is less than the work done by
the construction worker. What happens to the missing energy
Friction! the construction worker have to work (spend
energy) against friction
No. 54A crate of nails with a mass of 280.0 kg is pushed up a ramp in order to raise the crate 0.750 m above the ground (9pts)A.What is the useful work done by this machine?
B. If the ramp has no friction, and therefore an efficiency of 100.0%, what is the force needed to push the crate along the ramp?
C. In reality, friction reduces the ramp’s efficiency to 43.0%. What force must now be applied to the crate to push it along the ramp?
No. 55A forklift developed in Sweden is able to do 1.8 X106 J of
useful work in lifting a heavy load. Suppose 7.6 X106 J must be done by the lift’s motors on the load in order to
accomplish this task. What is the efficiency of the forklift?
No. 56A motor with an efficiency of 88.0% operates a crane with an efficiency of 42.0%. If the power supplied to the motor is 5500 watts, with what
constant speed does the crane lift a 410.0 kg crate of machine parts?
No. 57A 225 kg crate is pushed horizontally
with a force of 710.0 N. If the coefficient of friction is 0.250, calculate the
acceleration of the crate.
No. 58A rightward force of 25.0 N is applied to a 4.00-kg object to
move it across a rough surface with a rightward acceleration of 2.50 m/s/s. Use the diagram to determine the
gravitational force, normal force, frictional force, net force, and the coefficient of friction between the object and the
surface.
No. 59A car spins out on an ice covered road. The car’s length is 4 meters. The driver is 1 meter from the car’s spin center. The car spins 5 times around in 2 seconds.A. What is the period and frequency of the driver in the car? B. What is the tangential velocity of the driver? C. What is the centripetal acceleration of the driver? D. What is the centripetal acceleration in terms of g? [divide your answer in c by the value of g]
No. 60A 1500 kg sports car drives at a constant speed around an unbanked track with a radius of 200 m. The car completes one lap every 63 seconds.A. What is the speed of the car?
B. Is the car accelerating? If yes, what is the magnitude and direction of the acceleration? Why?
C. What is the minimum coefficient of friction that will keep the car from sliding off the track? (Ff = Fc)
No. 61A 500 kg car travels around a curve with a centripetal force of 2500 N. The curve’s radius is 200 m.A. What is the velocity of the car?
B. What is the centripetal acceleration of the car?
No. 62A 45.0 kg crate of oranges slides from rest down a 22.5o incline (from inside the truck to the ground).
The frictional force has a magnitude of 126 N . What is the net acceleration of the crate?
HOMEWORKAnswer the rest of the questions!
WRAP UPNone
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May the POSITIVE FORCE be with you!
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