Answer in one word/a few words. The first person to discover gravitational force
Answer in one word/a few words. A material that a magnet can attract
Answer in one word/a few words. An act of moving an object forward by applying force on it
Answer in one word/a few words. The force that pulls down every object towards the centre of the earth
Answer in one word/a few words. The force exerted by a surface when an object moves across it
Answer in one word/a few words. The force applied by the muscles of human body
