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

Question

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 work required to lift a mass one meter depends on the speed at which it is raised..
3. A simple machine cannot reduce the work required to do a task.
4. The acceleration of an object is same in all inertial reference frames.
5. Less power is required while lifting a box up quickly than while slowly lifting it.
6. A particle's kinetic energy can change without having any net work done it.

Explanation / Answer

.1) true => W = integral(f.dS) when f is constant then W = F.S

2) False => it depends on force and in turn the rate of change of velocity i.e acceleration

3) true

4) true

5) p= f.V => when v is high power = high hence statement is false

6) can be true when F.s =0 that is when force is acting perpendicular to displacement (incase of circular motion )

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