Unit 3 Test Corrections

A box is resting on a flat surface. A person pushes the box to the right, but it moves slowly due to resistance. Complete the statements with the correct forces acting on the box. The force that pulls the box downward is called ________.

• gravity

• friction

• tension

• normal force

Tags

NGSS.MS-PS2-4

The force applied by the person pushing the box to the right is called ________.

• applied force

• gravitational force

• frictional force

• normal force

Tags

NGSS.MS-PS2-2

A stack of books is resting on a table. Choose the correct answer from each drop-down to complete the statement. The books lying on the table exert a ________ force on the table, while the table is exerting an ________ reaction force on the book.

• gravitational; normal

• normal; gravitational

• frictional; magnetic

• magnetic; frictional

Tags

NGSS.MS-PS2-2

Action forces and reaction forces always occur together. Which of the following is an example of an action-reaction force pair?

• A swimmer pushes the water backward and the water flows over the swimmer.

• A bird flies by moving their wings and the feathers move in the wind.

• The tires on a car push against the road and the road pushes back on the tires.

• A person is pushing on a rock and the rock does not move.

Tags

NGSS.MS-PS2-1

Action and reaction forces refer to two forces that are equal in magnitude but opposite in direction. Describe the forces below as an action or reaction force. Select ONE correct answer in each row.

• Action Force

• Reaction Force

Tags

NGSS.MS-PS2-1

Action and reaction forces refer to two forces that are equal in magnitude but opposite in direction. Describe the forces below as an action or reaction force. Select ONE correct answer in each row.

• Action Force

• Reaction Force

Tags

NGSS.MS-PS2-1

Why is it more difficult to push a heavy box across a carpeted floor compared to a smooth surface?

• Because the carpet increases friction.

• Because the carpet decreases friction.

• Because the carpet is softer.

• Because the carpet is harder.

Determine if each description is an applied force or a normal force.

A computer on a desk

• Normal Force

• Applied Force

Determine if each description is an applied force or a normal force.

Pushing a lawn mower

• Normal Force

• Applied Force

A force is a push or a pull on an object.

• True

• False

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2