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Page 1: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Page 2: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Warm-up QuestionWarm-up Question

A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and F3 acting 120o up and 120o down from the +x direction, respectively. If the spaceship is traveling at a constant speed in the +x direction and the magnitude of all the forces is the same, which statement is true?

A)The spaceship will begin to slow down

B)The spaceship will begin to accelerate downward

C)The spaceship will begin to speed up in the positive y direction

D)The spaceship will begin to speed up in the positive x direction

E)None of the above

Page 3: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

1

20k

1

10k

m1=1kg

m2=3kg

m3

What must the mass of m3 be to slide m2 out from under m1?

Page 4: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

To go to a football stadium from your house, you first drive 1000m north, then 500m west, and finally 1500m in a direction 20o south of west. (a) relative to your home, the football stadium is in what direction? How far away is your house from the stadium in a straight line? 

Page 5: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

Walking along the beach you notice there is an island at an angle of 30o with respect to the shore. You then walk 50m along the shore, ending on the other side of the island. A measure tells you the island is now 40o out from the shore. How far away is the island from the shore? 

Page 6: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Static EquilibriumStatic Equilibrium

A 1000 kg steel beam is supported by two cables. What is the tension in each cable?

Page 7: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

A 90 kg man is standing on a scale that determines weight. This scale is in an elevator that is accelerating in the upward direction.Will the man’s 90 kg:

A. increaseB. decreaseC. stay the same

Page 8: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Quiz QuestionQuiz QuestionA gerbil runs 85cm in a straight line. This takes it 5s. Then the

gerbil turns around and runs in the opposite direction 65cm. This takes it 3s. What is the magnitude of the gerbil’s average velocity for the entire trip?

A) 21.7cm/s

B) 17.0cm/s

C) 19.3cm/s

D) 0.25cm/s

E) 0.667cm/s

F) 20.0cm/s

Page 9: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

Are two vectors with the same magnitude necessarily equal?

Page 10: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Discussion QuestionDiscussion QuestionWhat is the total distance Δx traveled by the particle?

A) 50m

B) 40m

C) 30m

D) 20m

Page 11: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Page 12: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

A father is now three times as old as his son. Twelve years ago he was six times as old as his son. Find the present age of each. 

Page 13: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

It takes 0.2 second for the back end of a 1500kg car to crumble within 2m of the front end, in a collision with an immovable concrete wall. What is the net force that acts on the front bumper during this time?

 

Page 14: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Quiz QuestionQuiz QuestionWhich plot represents the velocity vs. time of the particle

represented by the position vs. time graph?

Page 15: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Discussion QuestionDiscussion QuestionBelow a plot of the position vs. time has been drawn. Draw the

corresponding acceleration and velocity graphs.

Page 16: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Discussion QuestionDiscussion QuestionBelow a plot of the position vs. time has been drawn. Draw the

corresponding acceleration and velocity graphs.

Page 17: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Quiz QuestionQuiz QuestionUse dimensional analysis to determine what the area under the

curve represent?

A) Average Velocity

B) Speed

C) Acceleration

D) Distance traveled

Page 18: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Discussion QuestionDiscussion QuestionBelow a plot of the velocity vs. time has been drawn. Draw the

corresponding acceleration and position graphs.

Page 19: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Discussion QuestionDiscussion QuestionBelow a plot of the position vs. time has been drawn. Draw the

corresponding acceleration and velocity graphs.

Page 20: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Quiz QuestionQuiz Question

Page 21: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Page 22: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Describe what’s happening

What is Fred’s average speed?

What is Brutus’s average speed?

Page 23: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Page 24: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Describe what’s happening

Page 25: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

A 90 kg man is standing on a scale that determines weight. This scale is in an elevator that is accelerating in the upward direction.Will the man’s apparent weight:

A. increaseB. decreaseC. stay the same

Page 26: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

a.) How much force does an 80 kg astronaut exert on his chair while sitting at rest on the launch pad?

b.) How much force does an 80 kg astronaut exert on his chair while accelerating straight up at 10 m/s^2?

Page 27: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

No Friction No Friction

A 10 kg crate is being slid across a frictionless floor by a 40 N force acting at an angle of 35 degrees below the horizontal. How far will the crate slide after 10 seconds?

Page 28: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Friction Friction

a.) A 10 kg crate is being pushed on by a 40 N force acting at an angle of 35 degrees below the horizontal. What coefficient of static friction will keep this crate from moving?

b.) If the coefficient of kinetic friction is 10% less than that of static friction, what will the acceleration of the crate be?

Page 29: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Discussion QuestionDiscussion Question

Standing on ice, a father and daughter face each other, pressing flat hands together. They push off each other and start moving away from each other. Which of these statements is correct.

A)The daughters acceleration is the same as here fathers

B)Both are decelerating since their push is in the opposite direction of their motion

C)While in contact their hands are not moving

D)After they push off, both leave with the same speed

E)None of the above

Page 30: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Page 31: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Page 32: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Discussion QuestionDiscussion QuestionWhat is average velocity of the particle over the time interval

Δt=50.0s?

A) 30m/s

B) 0.6m/s

C) 2.0m/s

D) 10m/s

Page 33: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Find the tension in each cable and the applied force F required for that the system to not move.

Page 34: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

Page 35: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201201

Discussion QuestionDiscussion QuestionBelow a plot of the position vs. time has been drawn. Draw the

corresponding acceleration and velocity graphs.

Page 36: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211

1

20k

1

10k

m1=1kg

m2=3kg

m3

What must the mass of m3 be to slide m2 out from under m1?

Page 37: Physics 201/211. Warm-up Question Warm-up Question A spaceship has a force, F1, acting on it in the +x direction. It also has two other forces, F2 and

PhysicsPhysics 201/211201/211


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