- Work (W) is calculated using the formula W = Fd, where F is force in newtons and d is distance in meters. For example, pushing a 1000 N car 50 m results in W = 1000 N × 50 m = 5,000 J.
- Power (P) is calculated using the formula P = W/t, where W is work in joules and t is time in seconds. For instance, doing 120 J of work in 2 seconds gives P = 120 J / 2 s = 60 watts.
- Work requires motion in the direction of the applied force. If an object does not move (d = 0), no work is done, regardless of the force applied.
- When comparing two individuals performing the same work, the one who completes it in less time uses more power. For example, Bob lifting rocks in 10 seconds uses 20 W, while Joe taking 20 seconds uses only 10 W, even though both do 200 J of work.
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