PHYS 122 Lecture Notes - Lecture 2: Net Force

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The net work acting on an object is equal to the change in kinetic energy. Work done by the net force on a particle equals the change in the particle"s kinetic energy. Total work done on particle = work done by net force. The work done by the new force is called the total work w(tot) Average power during time interval t > p(av) = w/ t (work done during time interval / duration of time interval) The si unit of power is the watt (1 w = 1 j/s), but another familiar unit is the horsepower (1 hp = 746 w) The total mechanical energy of a system is the sum of its kinetic and potential energy. A quantity that always has the same value is called a conserved quantity. When only the force of gravity does work on a system, the total mechanical energy of that system is conserved.

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