1. What happens to the total energy of a moving object if there is NO external applied on it? a. It increases b. It decreases c. It remains constant d. increases then decreases 2.A particle is thrown upward with some kinetic energy. What happened to its kinetic energy at the highest point or height it reaches? a. Its kinetic energy is lost b. It’s all kinetic energy is absorbed by the air c. Its kinetic energy is converted to potential energy d. Its kinetic energy is remain same 3. A construction worker holds a heavy tool box at 1.5 meters high. How much work is done by the worker? a. Zero b. F x cos θ c. mgH d. ½ mv^2

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.