Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 5, "Applications of Newton's Laws". There are questions on friction (static and kinetic), circular motion and centripetal forces, and drag forces. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.

Q1: A crate rests on the flatbed of a truck which is initially traveling at 15 m/s on a level road. The driver applies the brakes and the truck is brought to a halt in a distance of 38 m. If the deceleration of the truck is constant, what is the minimum coefficient of friction between the crate and the truck that is required to keep the crate from sliding?

0.20
0.30
0.39
0.59
It cannot be determined without knowing the mass of the crate.

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Q2: A worker pulls horizontally on a rope that is attached to a 10 kg crate resting on a rough floor. The coefficients of static and kinetic friction are 0.5 and 0.3, respectively. The worker pulls with a force of 40 N. The frictional force exerted by the surface is

30 N
50 N
10 N
100 N
40 N

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Q3:

The free-body diagram that best represents the forces acting on the student at rest on the incline is

1
2
3
4
5

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Q4: A certain crane can provide a maximum lifting force of 25 000 N. It hoists a 2000 kg load starting at ground level by applying the maximum force for a 2 second interval; then, it applies just sufficient force to keep the load moving upward at constant speed. Approximately how long does it take to raise the load from ground level to a height of 30 m?

2 s
5 s
7 s
9 s
10 s

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Q5: The figure shows a top view of a ball on the end of a string traveling counterclockwise in a circular path. Assume that air resistance is negligible.

The free-body diagram that best represents the acceleration of the ball is

1
2
3
4
5

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