1) The moon remains in its orbit around the earth beause of the __________ forces between the two bodies? a) Magnetic b) Frictional c) Electrostatic d) d. Gravitational 2) What does the gravity do on Earth? a) It allows volcano to erupt. b) It allows ship to sail fast. c) It pulls object towards the center of the earth. d) It keeps the thing floating. 3) Who discovered the gravitational force? a) Isaac Newton b) Albert Einstein c) Galileo Galilei d) Charles Darwin 4) When did he discover? a) about 100 years ago b) about 200 years ago c) about 300 years ago d) about 400 years ago 5) The amount of gravitational forces depends on an objects ____. a) size b) mass c) location d) shape

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