True or False: Without friction or work by an external force, the sum of the pot

Question

True or False:

Without friction or work by an external force, the sum of the potential and kinetic energies of a body is constant.
TrueFalse

Work is done when the form of energy changes.

TrueFalse Less power is required while lifting a box up quickly than while slowly lifting it.
TrueFalse Energy conservation law for a projectile (no friction): Potential energy decrease equals the kinetic energy increase.
TrueFalse A source of energy is required to do work.
TrueFalse Work cannot be done in the absence of motion.

Explanation / Answer

I hope this helps you. it's been ages since I've been in physics so I had to randomly guess on some.I would look up a few things on the physics of friction and energy. they could be some use(dont do wiki it's usally an option do a site a library recommends those are the information hotspots.) Hope this helps and good luck :)

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