AnswersPOP Physics 2627Lesson 2: Newton's First and Third Laws

Lesson 2: Newton's First and Third Laws Answers

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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?

A
A force must be applied to it when it slows to a position of rest.
B
A force must be applied to it before it slows to a position of rest.
C
No force is needed; an object in motion stays in motion.
D
Many forces must act upon it to keep it in motion.
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[___] N

Answer:

0

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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.

A
A girl leans against a wall and the wall pushes on the girl.
B
A baseball hits a glove and the glove pushes on the ball.
C
A boy pushes on a door and the door swings open.
D
A soccer player kicks a ball and then another soccer player kicks the same ball.
E
A cat rubs up against a tree and the tree pushes against the cat.
F
A student pushes another student standing in a line, and that student falls into the next student.
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Why is Li able to avoid Raj’s tackle? Choose the best description.

A
Raj has more mass and therefore more inertia, so he can change his motion more easily than Li.
B
Raj has more mass and therefore less inertia, so he can change his motion more easily than Li.
C
Li has less mass and therefore more inertia, so he can change his motion more easily than Raj.
D
Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.
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Based on the free-body diagram, the net force acting on this wheelbarrow is [___] N.

Answer:

-150

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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?

A
It is in static equilibrium.
B
It has less friction.
C
It has inertia.
D
It loses gravity when in motion.
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Based on the free-body diagram, the net force acting on this firework is [___] N.

Answer:

0

96163

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?

A
A force must be applied to it when it slows to a position of rest.
B
A force must be applied to it before it slows to a position of rest.
C
No force is needed; an object in motion stays in motion.
D
Many forces must act upon it to keep it in motion.
96164

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

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