Impulse vs Work

Practice Problems
Impulse vs Work

Directions: On this worksheet you will examine the properties of force vs time (impulse) and force vs distance (work) as they apply to two objects of different masses.

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Question 1 Two masses, 4 kg and 7 kg, initially at rest, are both pushed by equal forces through the same distance across identical frictionless surfaces. Which mass would experience the greater acceleration?

7 kgboth masses experience the same acceleration4 kg

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Question 2 Which mass has the greater final velocity?

4 kgboth masses experience the same increase in velocity7 kg

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Question 3 Which mass gained the greater amount of kinetic energy?

both masses gain the same amount of kinetic energy4 kg7 kg

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Question 4 Which mass received the greater impulse?

both masses require the same amount of time to reach the end7 kg4 kg

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Question 5 If each mass was pushed by a 42-N force through a distance of 52 meters, what is the ratio of the change in momentum of the 4-kg mass to that of the 7-kg mass?

0.76:10.57:11.32:11:1

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Question 6 What is the final velocity of the 4-kg mass?

25.0 m/sec6.0 m/sec33.0 m/sec10.5 m/sec

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Question 7 How much time was required for the 7-kg mass to travel the entire 52 meters?

3.15 sec1.57 sec4.16 sec2.08 sec

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Question 8 Which formula correctly relates an object's kinetic energy and its momentum?

KE = 2v/p²KE = 2m/p²KE = ½(p²/m)KE = ½(p²/v)

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Question 9 Regardless of which mass is being examined, which graph will always has the greater area?

Force vs Timeboth are always equalForce vs Distanceneither is always larger