Lesson 2: Newton's First and Third Laws

Question 1

If it were possible to remove gravity and friction, think about what would happen to a football if it were tossed into the air. Assume the football is in a vacuum (no gravity or friction) and is continuously moving, which force(s) would be acting on the ball?

Revolt · Accepted Answer

No force is needed; an object in motion stays in motion.

Question 2

Every action force has an opposite and equal reaction force. Determine which of these are action/reaction pairs. Check all that apply.A girl leans against a wall and the wall pushes on the girl.A baseball hits a glove and the glove pushes on the ball.A boy pushes on a door and the door swings open.A soccer player kicks a ball and then another soccer player kicks the same ball. A cat rubs up against a tree and the tree pushes against the cat.A student pushes another student standing in a line, and that student falls into the next student.

Revolt · Accepted Answer

A girl leans against a wall and the wall pushes on the girl.; A baseball hits a glove and the glove pushes on the ball.; A cat rubs up against a tree and the tree pushes against the cat.

Question 3

Why is Li able to avoid Raj’s tackle? Choose the best description.

Revolt · Accepted Answer

Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Question 4

Question 4

Revolt · Accepted Answer

96153

Question 5

A passenger in a car is holding an open water bottle when the car stops suddenly. Why does the water in the bottle splash out when the car stops?

Revolt · Accepted Answer

It has inertia.

Question 6

Question 6

Revolt · Accepted Answer

96156

Question 7

Question 7

Revolt · Accepted Answer

96157

Lesson 2: Newton's First and Third Laws Answers

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