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, 3 kg and 8 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?
3 kg
both masses experience the same acceleration
8 kg
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Question 2
Which mass has the greater final velocity?
3 kg
both masses experience the same increase in velocity
8 kg
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Question 3
Which mass gained the greater amount of kinetic energy?
both masses gain the same amount of kinetic energy
3 kg
8 kg
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Question 4
Which mass received the greater impulse?
3 kg
8 kg
both masses require the same amount of time to reach the end
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Question 5
If each mass was pushed by a 31-N force through a distance of 68 meters, what is the ratio of the change in momentum of the 3-kg mass to that of the 8-kg mass?
0.38:1
0.61:1
1:1
1.63:1
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Question 6
What is the final velocity of the 3-kg mass?
37.5 m/sec
3.9 m/sec
10.3 m/sec
23.0 m/sec
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Question 7
How much time was required for the 8-kg mass to travel the entire 68 meters?
2.96 sec
1.81 sec
3.63 sec
5.92 sec
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Question 8
Which formula correctly relates an object's kinetic energy and its momentum?
KE = ½(p
2
/v)
KE = 2v/p
2
KE = 2m/p
2
KE = ½(p
2
/m)
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Question 9
Regardless of which mass is being examined, which graph will always has the greater area?
both are always equal
Force vs Distance
Force vs Time
neither is always larger
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