Answers2003390-Physics 1 Honors Sem. 1 - PetersLesson 2: Newton's First and Third Laws

Lesson 2: Newton's First and Third Laws Answers

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A car is moving east along a straight, level road at a constant velocity. Which forces form an action/reaction force pair?

A
the force of the tires against the road and the force of the road on the tires
B
the weight of the car and the force of the road pushing up on the car
C
the force of the engine on the car and the force due to friction on the car
D
the normal force on the car and the force of the car pulling on Earth
2
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A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off. What force does the wall exert on the ball?

A
10 N to the left
B
10 N to the right
C
more than 10 N to the left
D
more than 10 N to the right
3

Which statements describe an object in motion that has no external force acting on it? Check all that apply.It accelerates and speeds up.It moves at a constant speed.It decelerates and slows down.It changes direction.It moves in the same direction.

A
It accelerates and speeds up.
B
It moves at a constant speed.
C
It decelerates and slows down.
D
It changes direction.
E
It moves in the same direction.
4

John pushes Hector on a plastic toboggan.The free-body diagram is shown.

Question illustration
A
245 N
B
735 N
C
490 N
D
980 N
5

Juan draws a free-body diagram of an object that is in dynamic equilibrium moving to the left.

Question illustration
A
X: 45 NY: –45 N
B
X: –45 NY: 30 N
C
X: 30 NY: –45 N
D
X: 30 NY: –30 N
6

A box is sitting on the floor. The box was then pulled with a force, Ft. The box did not move. The free-body diagram of the box is shown.

Question illustration
A
It is moving up with a net force of 20 N.
B
It is moving to the right with a net force of 10 N.
C
It is in dynamic equilibrium with a net force of 0 N.
D
It is in static equilibrium with a net force of 0 N.
8

Kamala puts on inline skates and stands facing a wall. When she pushes against the wall, she rolls backward.Why does pushing harder make her roll faster?

A
The force of friction between the wheels and the ground decreases.
B
The force of the wall pushing on her increases.
C
The additional force decreases her weight.
D
The extra force causes an increase of the normal force from the ground.
9

Which object is in static equilibrium?

A
a rolling ball that has a net force acting on it
B
a cruising car that has no net force acting on it
C
a book that has no net force acting on it and is sitting on a table
D
a vase that has a net force acting on it and is sitting on a shelf
10

Which situation is contrary to Newton’s first law of motion?

A
An object at rest begins to move when an external force is applied.
B
A moving object has a constant velocity under the influence of balanced forces.
C
An object at rest stays at rest as long as unbalanced forces act on it.
D
A moving object slows down when an external force is applied.

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