## AQA GCSE Kinetic energy

Kinetic energy is the energy stored in a moving object.

Kinetic energy depends on mass of an object and the speed.

**Kinetic energy, E _{k} = ½ x mass x speed^{2}**

**Kinetic energy** (Joules, **J**)

**Mass** (kilograms,**kg**)

**Speed** (**m/s**)

If **mass increases**, so will **kinetic energy**. They are** directly proportional** to each other.

^{2}= 4 This effect happens becuase speed is a squared quantity in the kinetic energy equation.

^{2}. Unless you square root at final stage.

**Practice questions**

1.A ball of mass 0.1kg is travelling at a speed of 6m/s. Calculate the kinetic energy

2. A toy car with a mass of 60g is moving at 2m/s. Calculate its kinetic energy

3. Calculate the mass of a cannon ball that has a kinetic energy of 60,000J and a velocity of 10m/s

4. Calculate the velocity of a car if it has a kinetic energy of 45000J and a mass of 700kg.

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