- Work is done when a force causes an object to move in the direction of the force. No work is done if there is no movement. - Work (W) is calculated as the product of the magnitude of the force (F) and the magnitude of displacement (d) in the direction of the force. - Power is the rate at which work is done and is calculated as work (W) divided by time (t). It is measured in watts, with 1 watt equaling 1 joule per second.