STAAR Review 8.7B Newton's 3 Laws

A student bonces a basketball off the gym floor.

Which statement correctly describes the action-reaction force pair that causes the ball to bounce?

• The gym floor pushes up on the ball as the ball pushes down on the floor with an equal amount of force.

• The gym floor pushes up on the ball with a greater amount of force than the ball pushes down on the floor.

• The gym floor pushes up on the ball as gravity pulls down on the ball with an equal amount of force.

• The gym floor pushes up on the ball with a greater amount of force than gravity pulls down on the ball.

Tags

NGSS.MS-PS2-1

A 1.5 kilogram block is pushed rapidly and released. The block continues to slide some distance until it comes to a stop. What is the name of the force that is action against the block?

(a)  

The mass, applied force, and frictional force for four carts are shown in the table.

Based on the data table, which cart has the lowest acceleration?

• W

• X

• Y

• Z

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

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 fence post

  Reaction: The force of the fence post on the bird

• 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

Tags

NGSS.MS-PS2-1

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 coin's inertia decreases on the way up and increases on the way down.

• The force of gravity causes the coin to change in velocity

• 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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NGSS.MS-PS2-2

NGSS.MS-PS2-4

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.

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.