Whenever a force causes an object to move, work is carried out. For example, lifting up a heavy object is work. Work and energy are both measured in joules (J).
W = F x d
- – W is the work carried out in joules (J)
- – F is the force that’s applied in newtons (N)
- – d is the distance which is moved in the direction of the force in metres (m)
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Power
Power refers to how quickly the work is carried out and how fast the energy is transferred. It’s measured in watts (W).
P = E / t
- – P is the power in watts (W)
- – E is the energy transferred (or work carried out) in joules (J)
- – t is the time taken in seconds (s)
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Kinetic energy
Objects that are moving posses kinetic energy. How much energy they have depends on:
- – mass
- – speed
Kinetic energy can be calculated using the following equation:
Ek =