Jessica is comparing two balls. One ball has a mass of 1 kg, and the other has a mass of 2 kg. She pushes each with a force of 100 N. How do the accelerations of the two balls compare?

• The 1 kg ball accelerates the same as the 2 kg ball.

• The 1 kg ball accelerates half as much as the 2 kg ball.

• The 1 kg ball accelerates twice as much as the 2 kg ball.

• The 1 kg ball accelerates four times as much as the 2 kg ball.

Tags

NGSS.MS-PS2-2

A fisherman steps off a boat, which is in the water, onto a dock. What happens?

• The boat and dock do not move.

• The boat moves toward the dock.

• The boat moves away from the dock.

• The dock moves away from the boat.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Look at the diagram of forces acting on an object. The picture shows a push and a pull acting on a box of books sitting on the floor. What is the net force toward the right on the box?

• 0 N

• 50 N

• 100 N

• 2,500 N

Tags

NGSS.MS-PS2-2

When two objects having different masses collide, they move away from each other at different speeds. Which is true of the forces exerted at the moment of impact?

• The forces exerted when they collide are equal and opposing.

• The forces exerted when they collide are unequal and opposing.

• The forces exerted when they collide are equal and in the same direction.

• The forces exerted when they collide are unequal and in the same direction.

Tags

NGSS.MS-PS2-1

An airplane is traveling at a speed of 200 m/s relative to the Earth. A person walks toward the front of the plane at a speed of 1 m/s. How fast is that person traveling in reference to the other people on the airplane?

• 0 m/s

• 1 m/s

• 200 m/s

• 201 m/s

Two equal forces act in opposite directions on object A. Two unequal forces act in opposite directions on object B. If these are the only forces acting on objects A and B, which of these conclusions is true?

• Only object A will accelerate.

• Only object B will accelerate.

• Both object A and object B will accelerate.

• Neither object A nor object B will accelerate.

Tags

NGSS.MS-PS2-2

The diagram shows the forces acting on a running shoe. As force F is applied, the shoe does not move. Which statement describes the forces?

• The net force is acting to the left.

• The net force is moving to the right.

• The net force is acting in an upward direction.

• The net force is zero, and all forces are balanced.

The same force is applied separately to two objects, A and B. B is twice the mass of A. What happens?

• B's acceleration is half that of A.

• B's acceleration is twice that of A.

• B's acceleration is one-fourth that of A.

• B's acceleration is four times that of A.

Tags

NGSS.MS-PS2-2

Given the position of an object at two different times, which of the following can you determine?

• The average speed of the object over a given time.

• The average velocity of the object over the given time.

• The average acceleration of the object over the given time.

You are sitting in a crowded movie theater waiting for friends. The following are ways that you could describe your location within the theater using reference points. Which description may be unreliable because of the reference point?

• I am sitting near a theater worker, fifth seat from the side.

• I am in the fifth row from the back, tenth seat from the right side.

• I am in the sixth row from the front, tenth seat from the right side.