Select which of the following statements are True or False. Assume Newtonian Mec

Question

Select which of the following statements are True or False. Assume Newtonian Mechanics.
1. The work done by a constant force acting on an object is equal to the magnitude of the force times the distance the object moves.

2. The speed of an object is same in all inertial reference frames.

3. The work required to lift a mass one meter depends on the speed at which it is raised..

4. A particle's kinetic energy can change without having any net work done it.

5. A simple machine may reduce the force required to do a task.

6. The power required to lift a mass does not depend on the speed at which the mass is raised.

Explanation / Answer

1-True

2-False

3-False (speed should be constant but no need to know the value of speed)

4-False (from the work-kinetic energy thoerem, the work done on a body is equal to change in its kinetic energy)

5-True ( for constant torque, by increasing length of the lever arm, we can reduce the force)

6-False (power required=mg* constant speed)

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