In which of the following situations is there a variable force? a) A spring stre

Question

In which of the following situations is there a variable force? a) A spring stretching b) A freely falling ball c) A block sliding on a rough surface d) A block with constant acceleration e) Both a) and d) 2 [Warning: trick question]. In which situation is can the work done by a variable force always be approximated by force times distance? a) When the distance is very small b) When the force is very small c) When the force and displacement are in the same direction d) When the force and distance are very small e) None of the above 3. The work done by a force that varies in magnitude can be obtained from which of the following choices? a) by calculating the time-averaged force and multiplying by the displacement b) by finding the signed area under a force versus displacement graph c) by integrating the force with respect to displacement d) by either choice (b) or (c) e) by either choice (a), (b) or (c) 4. Which one of the following choices is not a unit of power? a) kg middot m^2/s b) ft middot lb/s c) horsepower d) J/s e) W 5. The power due to a force depends on which of the following parameters? a) the magnitude of the force and the displacement of the object b) the magnitude of the force and the velocity of the object c) the mass of the object and the velocity of the object d) the work done on the object and its displacement e) the mass of the object and the displacement of the object

Explanation / Answer

1.e

Both a) and d)

2.c

the work done by a variable force always be approximated by force times distance When the force and displacement are in the same direction

3.b

The work done by a force that varies in magnitude is obtained by finding the area under a force versus displacement graph

4.a

kg × m2/s is not a unit of power

5.b

The power due to a force depends on the magnitude of the force and the velocity of the object

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