Any moving object has kinetic energy, from a planet to an atom they have kinetic energy.
The heavier an object is and the faster it moves, the more kinetic energy it has.
If we through a bowling ball and an apple at the same speed, the bowling ball has more kinetic energy than the apple.
At the top of a hill the ball has no kinetic energy because it isn’t moving.
However because it rests on top of a hill it does have Potential and Gravitational energy.
Once we give it a push, the ball rolls down the hill, and the potential and gravitational energy is converted into kinetic energy.
When you turn on a fan, you feel the air pushing against you.
The blades turning contain kinetic energy, which is transferred to the air. This causes the air to move towards you.
