Newton's Laws of Motion Test Review

A photograph of a bird perched on a fence post is shown. Which description best identifies the action-reaction pair between the bird and the fence post?

• Action: The force of the bird on the wires Reaction: The force of the wires on the fence post
• Action: The force of the wires on the wires Reaction: The force of the bird on the fence post
• Action: The force of the fence post on the bird Reaction: The force of the bird on the wires
• Action: The force of the bird on the fence post Reaction: The force of the fence post on the bird

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112.20.b.6.C

When a coin is tossed in the air, it travels upward, gradually slows down, momentarily reaches zero speed, then moves back downward with increasing speed. Which statement best explains this change in the coin's motion?

• The force of gravity causes the coin to change its velocity.
• The coin's inertia decreases on the way up and increases on the way down.
• The action-reaction force pair of gravity and the applied force cancel each other.
• The coin remains in its state of upward motion until the force of friction acts upon it.

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112.20.b.6.C

A steel ball is at one end of a box that is moving forward as shown. The box suddenly stops. According to Newton’s first law, what happens to the steel ball just after the box stops?

• Because of friction, the ball continues rolling forward at the same speed.
• Because of friction, the ball rolls forward at an increased speed.
• Because of inertia, the ball continues rolling forward at the same speed.
• Because of inertia, the ball rolls forward at an increased speed.

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112.20.b.6.C

A skater pushes off a wall and skates backward for a few meters before stopping. Which statement best describes an action–reaction force pair in this situation?

• The wall pushes on the skater when the skater pushes on the wall.
• The wheels slow down, and the skater stops.
• The skater exerts a force on the wall, and the wheels exert a force on the floor and begin to turn.
• The friction of the floor decreases when the wheels roll on the floor.

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112.20.b.6.C

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

• There are no forces acting on the rock.
• The only force acting on the rock is directed toward the sidewalk.
• The forces acting on the rock are all balanced.
• The sidewalk exerts an unbalanced force on the rock.

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112.20.b.6.C

A roller coaster containing three cars is accelerating at 10 m/s2 before it comes to an abrupt stop at the end of the ride. The mass of one car is 300 kg. How much force was exerted on the roller coaster to bring it to a stop?

• 30 N
• 900 N
• 3000 N
• 9000 N

Tags

112.20.b.6.C

A force that will work against motion in every situation is —

• the normal force
• weight
• gravity
• friction

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112.20.b.6.C

During a tug-of-war competition, neither team is able to gain an advantage. Which of the following explains the forces in this situation?

• The forces are balanced.
• The forces are overcome by air friction.
• The mass of the rope cancels the forces being exerted on it.
• The forces are unbalanced.

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112.20.b.6.C

A rocket is traveling from Earth to Mars at 10,000 m/s. If no outside force is applied to it, what will happen to its speed over the course of the trip?

• Speed up
• Slow down
• Stay constant
• Changes depending on mass

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112.20.b.6.C

You are riding in a vehicle with a coffee cup on the dashboard while traveling 30 km/h. The vehicle makes a sudden stop to avoid hitting the car that has stopped in front of it. Which illustration best demonstrates what would happen to the coffee cup?

• 
• 
• 
• 

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112.20.b.6.C