The **kinetic energy** of an object is the energy it has due t its motion. Knietic energy depends on ..

- the
**mass** of the object
- the
**speed** of the object.

Kinetic energy can be calculated using the equation:

**E = 1/2 x m x v^2**

A moving car has kinetic energy because it has both mass and speed. If it moves at greater speed it has more kinetic energy despite the mass being the same. A lorry moving at the same speed as a car will have greater kinetic energy due to it's much greater mass.

During collisions the kinetic energy can be dissipated by using energy-abosorbing devices such as air bags, crumple zones , seat belts and side impact bars in cars.

Unlike friction brakes, regenerative braking transfers unused energy back into useful electrical energy to recharge batteries and increase the overall efficiency of a vehicle.

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