1. When a current is supplied by a battery, _______ energy is converted to electrical energy.   nuclear   chemical   mechanical   Hint Half-n-half Clue   2. By definition, work is done when a _______ moves through a distance.   force   mass   pressure   Half-n-half Clue   3. _______ is the capacity to do work.   Pressure   Energy   Force   Half-n-half Clue   4. The energy acquired by a body because of its motion is called potential energy.   True   False   5. A machine that produces 60 J of work by using 80 J of energy has an efficiency of   20 J   25 %   75 %   15 J   Half-n-half Clue   6. Kinetic energy of a body in motion equals the product of half its mass and the square of its _______   velocity   distance   acceleration   Half-n-half Clue   7. Efficiency of a machine equals   Work Output / Work Input × 100 %   Work Input / Work Output × 100 %   Work Output / (Work Input + Work Output) × 100 %   Work Input / (Work Input + Work Output) × 100 %   Half-n-half Clue