Newton's Laws

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 in 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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8.6C Newton's Laws

A pitcher throws a ball toward a player holding a baseball bat. The player uses the bat to hit the ball with a 10 N force. Which statement correctly describes the reaction force between the bat and ball?

The reaction force is the force...

• that causes the ball to move toward the bat

• applied to the bat by the player holding the bat

• that pulls the ball toward the ground

• of the ball on the bat

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8.6C Newton's Laws

The picture shows an aerialist walking on a tightrope and holding a balancing bar.

An action-reaction pair of forces exists between -

• the aerialist's feet and the rope

• the rope and the balancing bar

• the two ends of the rope

• the aerialist's arms and legs

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8.6C Newton's Laws

Four boxes are sliding with constant speed before each box experiences an unbalanced force of 8N.

Which box would experience the greatest acceleration when the unbalanced force is applied?

• The box with a mass of 2 kg

• The box with a mass of 4 kg

• The box with a mass of 6 kg

• The box with a mass of 8 kg

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8.6C Newton's Laws

The unusual strength of glue makes it able to hold a heavy object, or load, as shown in the diagram below.

If the load exerts a strong downward force, the glue -

• destroys the force

• exerts a stronger downward force

• causes the load to accelerate upward

• exerts an upward force that is equal to the downward force

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8.6C Newton's Laws

Which 3 objects on the list are experiencing an unbalanced force?

(Select 3)

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8.6C Newton's Laws

How can Newton's law of action-reaction best be applied to explain the movement of a rocket?

As the fuel burns, ...

• gases push against the rocket, making it move upward

• escaping gases reduce air resistance

• the rocket moves slower

• the mass of the rocket increases

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8.6C Newton's Laws

A student jumps off a sled toward the west after it stops at the bottom of an icy hill.

Base don the law of action-reaction, in what direction will the sled most likely move as the student jumps off?

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8.6C Newton's Laws

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

• The car with the smaller mass will require less forces to stop than the larger mass car

• The car with the larger mass will maintain its velocity while traveling down the hill

• The car with the smaller mass will take longer to stop than the larger mass car

• The car with the larger mass will have less inertia than the car with the smaller mass.

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NGSS.MS-PS2-2

The sudden movement of tectonics plates, known as earthquakes, are caused by -

• the mass of the plates

• the weight of the plates

• unbalanced forces

• gravitational force

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8.6C Newton's Laws