__________ is one of the oldest sources of energy.

___________ is a vibration transmitted through a solid, liquid or gas.

A wheel with a rod attached to it is known as ______ arrangement.

______________ energy is a renewable energy source.

 _____________ is a simple machine used to hold things tightly together.

_________ means pushing or pulling an object.

______ is the ability to do work.

Choose the right answer _______ is the movement of electrical charges.

A stretched bow possesses mechanical energy due to its stretched position.

A moving car possess____________ energy.