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In AS Physics, work is done when a force causes an object to move in the direction of that force. If there is no movement, then no work is done, even if a force is applied. Work is measured in joules. Energy is the ability or capacity to do work and is also measured in joules. Energy exists in different forms, such as kinetic energy, which is the energy an object has because it is moving, and gravitational potential energy, which is the energy an object has because of its position or height above the ground. Energy cannot be created or destroyed; it can only be transferred from one object to another or changed from one form to another. Power is the rate at which work is done or energy is transferred, meaning how fast the work is carried out. Power is measured in watts, and one watt means one joule of energy is transferred each second.