8.6a

Which object in the diagram above is acted on by a net force of 5 N to the right?

• object A

• object B

• object C

• object D

Tags

NGSS.MS-PS2-2

A force gives energy to an object, causing it to move, stop moving, or change its direction. The graph shows the motion of a car. In the period shown on the graph, the car moved in one direction only.During what period were unbalanced forces acting on the car?

• 0–13 seconds

• 0–3 seconds

• 3–13 seconds

• 2–4 seconds

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The graphs show the motion of four different objects. Each object moved in a single direction during the time period shown in the graph. Which of the objects were acted on by unbalanced forces?

• objects B, C, and D only

• objects B and D only

• object B only

• object A only

Tags

NGSS.MS-PS2-2

Each of these cars moved in single direction during the time shown in the graph. Which car was acted on by balanced forces for the entire time shown in the graph?

• 1

• 2

• 3

• 4

Objects can move in a variety of ways, but they all need a force to make them move. Study the forces acting on the box. What question could be investigated using this experimental set-up?

• What is the average speed of the box’s motion?

• How is energy changed from one form to another?

• How is energy changed from one form to another?

• How do unbalanced forces affect motion?

Tags

NGSS.MS-PS2-2

Based on the information in the diagram, what is the net force acting on this object?

• 12 N downward

• 4 N upward

• 4 N downward

• 8 N to the left

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which diagram shows forces that would result in the box moving to the right?

• diagram A

• diagram B

• diagram C

• diagram D

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A ball sitting at the top of a hill gets pushed, rolls down the hill, rolls through a patch of grass at the base of the hill, and comes to a stop. At what point are balanced forces acting on the ball?

• when the ball is at rest in the patch of grass

• when the ball gets pushed and begins moving

• when the ball is rolling down the hill, going faster and faster

• when the ball is rolling through the patch of grass, going slower and slower

When a car suddenly stops moving, its passengers continue moving forward due to

• pressure.

• gravity.

• nertia.

• riction.

If you roll a ball across the floor, it will slow down and eventually stop due to —

• friction

• gravity

• positive acceleration

• negative acceleration