Answer:

C. Isaac Newton

• Newton's laws of motion, relations between the forces acting on a body and the motion of the body, first formulated by English physicist and mathematician Sir Isaac Newton.

D. Gravity

• friction also helps to keep the hula hoop up on the hula hooper's body while the force of the hula hoop's mass pulls it down (this downward force is due to gravity).

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Answer:

1. C. Isaac Newton

Newton's laws of motion, relation between the forces acting on a body and the motion of the body, first formulated by English physicist and mathematician Sir Isaac Newton.

2. D. Gravity

Gravity = The force of attraction which the earth exerts on objects on or near it's surface. pulling them downwards.

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Explanation:

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