Forces & Newton's Laws Test 2

A student pushes a 12 N book to the right with a force of 10 N. The book experiences a frictional force of 3 N. The free-body force diagram below represents the forces acting on the book.

What is the net force acting on the book?

• 7 N, to the right

• 11 N, to the right

• 13 N, to the right

• 37 N, to the right

An unbalanced force of 10 N is applied to an object of mass 4.0 kilograms. Calculate the acceleration of the object?

• A. 1.2 m/s²

• 2.5 m/s²

• 14 m/s²

• 40. m/s²

A student pushed a 10.0 kg box across a level, frictionless floor with an acceleration of 5.00 m/s². Calculate the force the student applied to the box?

• 0.500 N

• 2.00 N

• 15.0 N

• 50.0 N

The table below shows the relationship between the force on an object and the object’s resulting acceleration. What is the mass of the object?

• 1 kg

• 3 kg

• 12 kg

• 27 kg

The diagram below shows an 80 kg ice skater applying a force of 10 N to a 60 kg ice skater. Which statement best describes the results of applying the 10 N force?

• The skaters will not move at all.

• The skaters will accelerate away from each other at the same rate.

• The skaters will accelerate away from each other, but the 60 kg skater will accelerate at a faster rate.

• The 60 kg skater will accelerate away from the 80 kg skater, and the 80 kg skater will remain stationary.

Use the diagram to answer the question.

Brennan is traveling in a car at a constant speed. He quickly applies his brakes and stops to avoid an accident. Brennan’s body continues to move forward and is stopped by the seat belt. Why?

• an object in motion remains in motion unless acted on by an unbalanced force

• for every action there is an opposite equal reaction

• when mass increases a greater force is needed to accelerate the object

• the law of conservation of mass

A large rock has a mass of 750 kg. Calculate the weight of the rock on the surface of the Earth. (g= 9.8 m/s/s)

• 9.8 N

• 76.53 N

• 750 N

• 7,350 N

A child's toy is dropped from the ceiling. The Earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"?

• The toy is pulling on the string with an 8N force.

• The ceiling pulling up on the string with an 8N force.

• The string pulling down on the ceiling with an 8N force.

• The toy pulling up on the Earth with an 8N force.

You and a friend are moving a box.

According to the diagram, how will the forces on the box affect its movement?

• The net force is 0 N, the box will turn over.

• The net force is 0 N, the box will not move.

• The net force is 50 N to the right, the box will move towards Person A.

• The net force is 50 N to the left, the box will move towards Person B.

Use the picture to answer the question.

Two metal spheres are suspended on wires so that they hang next to each other, touching slightly. Sphere X is raised to a certain height and released. Which of the following results would provide support for Newton’s third law?

• Sphere Y is moving a distance too small to be measured.

• Sphere Y is moving to half the original height of Sphere X.

• Sphere Y is moving to the same original height as Sphere X.

• Sphere Y is moving to twice the original height of Sphere X.