Physics

Cassandra

2 November, 17:53

True or False:

Less power is required while lifting a box up quickly than while slowly lifting it.

A source of energy is required to do work.

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

Work cannot be done in the absence of motion.

Energy conservation law for a projectile (no friction) : Potential energy increase equals the kinetic energy decrease.

Work is done when the form of energy changes.