kinetic energy

What does the amount of kinetic energy an object has depend on?

The amount of kinetic energy an object has as a result of its mass and speed

what kind of objects contain energy in its kinetic store?

any object in motion has energy in its kinetic store

If an object speeds up….

 energy is transferred to its kinetic store

If an object slows down….

 energy is transferred away from its kinetic store

what equation can be used to calculate kinetic energy?

Ek = ½ × m × v²

What does Ek represent?

 kinetic energy in joules (J)

What does m represent?

mass of the object in kilograms (kg)

What does v represent?

v = speed of the object in metres per second (m/s) v

Calculate the kinetic energy stored in a vehicle of mass 1200 kg moving at a speed of 27 m/s.

Step 1: List the known quantities

• Mass of the vehicle, m = 1200 kg

• Speed of the vehicle, v = 27 m/s

  Step 2: Write down the equation for kinetic energy

• EK = ½ mv2

  Step 3: Calculate the kinetic energy

• EK = ½ × 1200 × (27)2 = 437,000 J