Exam 4: Force and Motion

Michael and Misty are standing motionless together on the ice at the center of a very slippery frozen pond. Michael (mass 75. kg) pushes Misty ( 46. kg), giving her an acceleration of 1.8 m/ s2 for 0.17 s while they were in contact. (a) What is Michael's acceleration? (b) Who exerts the greater force on the other? (c) What is Michael's speed relative to Misty?

(Short Answer)

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Question 21

Consider the Atwood machine in Figure 4-7. m₁= 33.0kg and m₂= 11.0kg, and the pulley mass is negligible. Figure 4-7 (a) Determine the acceleration. (b) What is the tension in the connecting string?

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Question 22

State Newton's 2nd law in your own words.

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Question 23

If you push a 4-kg mass with the same force that you push a 10-kg mass from rest, then

(Multiple Choice)

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Question 24

A toolbox, of mass M, is resting on a flat board, as shown in Figure 4-5. One end of the board is lifted up until the toolbox just starts to slide. $A toolbox, of mass M, is resting on a flat board, as shown in Figure 4-5. One end of the board is lifted up until the toolbox just starts to slide. The angle \theta that the board makes with the horizontal, for this to occur, depends on the$ The angle $\theta$ that the board makes with the horizontal, for this to occur, depends on the

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Question 25

A 2.0 kg mass and a 5.0 kg mass are hung on opposite sides of an Atwood's machine, and released. (a) What is the tension in the string? (b) How much time is required to fall 60 cm from rest?

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Question 26

Who has a greater weight-to-mass ratio, a person weighing 100 lb or a person weighing 150 lb?

(Multiple Choice)

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Question 27

You fall, while skiing, and one ski (of weight W) loosens and slides down an icy slope (assume no friction), which makes an angle ? with the horizontal. The force that pushes it down along the hill is

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Question 28

A sled of mass 10. kg slides down a flat hill that makes an angle of 10.° with the horizontal. If friction is negligible, what is the resultant force on the sled?

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Question 29

We usually think of friction "opposing motion". Explain how friction assists the motion of a car.

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Question 30

If you blow up a balloon, and then release it, the balloon will fly away as the air rushes out. This is an illustration of

(Multiple Choice)

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Question 31

A 3300. kg auto tows a 4500. kg horse trailer. If the engine causes the ground to push the car forward with 8.58 kN: (a) What is the acceleration of the horse trailer? (b) What is the forward force on the trailer? (c) With how much force does the trailer pull back on the car?

(Short Answer)

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Question 32

Galileo's Law of Inertia is the same as

(Multiple Choice)

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Question 33

A brick and a feather fall to the Earth at their respective terminal velocities. Which object experiences the greater force of air friction?

(Multiple Choice)

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Question 34

A book can slide down a frictionless hill at constant velocity.

(True/False)

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Question 35

A flatbed truck carries a load of steel. Only friction keeps the steel from sliding on the bed of the truck. The driver finds that the minimum distance in which he can stop from a speed of 20.0 mi/h without having the steel slide forward into the truck cab is 20.0 m. What would his minimum stopping distance be when going down a 10.0° incline?

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Question 36

An arrow is shot straight up. At the top of its path, the net force acting on it is

(Multiple Choice)

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Question 37

A load of steel of mass 6000 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 8000 N. When the truck is traveling 20.0 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

(Short Answer)

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Question 38

Consider a 42.0 kg block of ice sliding down the 34.0° plane, as shown in Figure 4-13. Assuming the kinetic coefficient of friction is 0.060, what is the acceleration of the block down the incline?

(Multiple Choice)

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Question 39

A decoration, of mass M, is suspended by a string from the ceiling inside an elevator. The elevator is traveling UPWARD with a constant speed. The tension in the string is

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Question 40

Showing 21 - 40 of 64

Exam 4: Force and Motion

Consider the Atwood machine in Figure 4-7. m1= 33.0kg and m2= 11.0kg, and the pulley mass is negligible. Figure 4-7 (a) Determine the acceleration. (b) What is the tension in the connecting string?

State Newton's 2nd law in your own words.

If you push a 4-kg mass with the same force that you push a 10-kg mass from rest, then

A toolbox, of mass M, is resting on a flat board, as shown in Figure 4-5. One end of the board is lifted up until the toolbox just starts to slide. The angle θ\thetaθ that the board makes with the horizontal, for this to occur, depends on the

A 2.0 kg mass and a 5.0 kg mass are hung on opposite sides of an Atwood's machine, and released. (a) What is the tension in the string? (b) How much time is required to fall 60 cm from rest?

Who has a greater weight-to-mass ratio, a person weighing 100 lb or a person weighing 150 lb?

You fall, while skiing, and one ski (of weight W) loosens and slides down an icy slope (assume no friction), which makes an angle ? with the horizontal. The force that pushes it down along the hill is

A sled of mass 10. kg slides down a flat hill that makes an angle of 10.° with the horizontal. If friction is negligible, what is the resultant force on the sled?

We usually think of friction "opposing motion". Explain how friction assists the motion of a car.

If you blow up a balloon, and then release it, the balloon will fly away as the air rushes out. This is an illustration of

A 3300. kg auto tows a 4500. kg horse trailer. If the engine causes the ground to push the car forward with 8.58 kN: (a) What is the acceleration of the horse trailer? (b) What is the forward force on the trailer? (c) With how much force does the trailer pull back on the car?

Galileo's Law of Inertia is the same as

A brick and a feather fall to the Earth at their respective terminal velocities. Which object experiences the greater force of air friction?

A book can slide down a frictionless hill at constant velocity.

An arrow is shot straight up. At the top of its path, the net force acting on it is

A load of steel of mass 6000 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 8000 N. When the truck is traveling 20.0 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

Consider a 42.0 kg block of ice sliding down the 34.0° plane, as shown in Figure 4-13. Assuming the kinetic coefficient of friction is 0.060, what is the acceleration of the block down the incline?

A decoration, of mass M, is suspended by a string from the ceiling inside an elevator. The elevator is traveling UPWARD with a constant speed. The tension in the string is

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Consider the Atwood machine in Figure 4-7. m₁= 33.0kg and m₂= 11.0kg, and the pulley mass is negligible. Figure 4-7 (a) Determine the acceleration. (b) What is the tension in the connecting string?