Definition- Kinetic energy is the energy an object has due to its motion. The faster and heavier the object is, the more kinetic energy it has.

What is kinetic energy:

• Kinetic energy is the energy an object has because it is moving.

• It exists only when something is in motion.

• The faster or heavier the object, the more kinetic energy it has.

• If the object is not moving, its kinetic energy is zero.

• It is a type of mechanical energy related to movement.

Can we measure kinetic energy?

• Yes, we can measure kinetic energy.

• It tells us how much energy a moving object has.

• We measure it in a unit called joules (just like we measure distance in meters or time in seconds).

Formula for Kinetic Energy:

Kinetic Energy (KE) = ½ × mass × speed²

This means:

• First, square the speed (multiply it by itself)

• Then multiply by the mass

• Then multiply by ½ (or divide by 2)

Example:

If a ball has:

• Mass = 2 kg

• Speed = 3 m/s

Then:

• Speed² = 3 × 3 = 9

• Mass × speed² = 2 × 9 = 18

• ½ × 18 = 9 joules

So, the ball has 9 joules of kinetic energy.

Favourite part/ note/ summary- kinetic energy is the energy an object has due to the motion. This can change depending on the objects mass and speed. We can measure kinetic energy in joules. Joules is a SI unit of measurement just like meter or litres. The formula for kinetic energy (EK) - EK = ½ × mass × speed². To turn it into joules you simple multiply the speed, then multiply it with mass and finally divide it by 1/2 and you get the answer. An example is given in the post.