Work is done when the form of energy changes.
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.
Without friction, and in the absence of external forces, the sum of the potential and kinetic energies of a body is constant.
Energy is required to do work.
Less power is required while slowly lifting a box than while lifting it up quickly.
Problem Weight is: 1
The Attempt at a Solution
I thought they were all true except for the first one. But that isn't correct. Thanks!