Practice Quiz

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. What is the magnitude of the net force acting on the book?

• 7 N

• 11 N

• 13 N

• 37 N

Three rocks with masses of 1 kg, 5 kg, and 10 kg fall from the same height. Which of the following describes the inertia of these rocks?

• None of the rocks have inertia.

• All the rocks have the same inertia.

• The 1 kg rock has more inertia than the other two rocks.

• The 10 kg rock has more inertia than the other two rocks.

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.

The diagram below represents two tug-of-war teams pulling on a rope and the forces for this situation. Group A applies a force of 420 N, and group B applies a force of 380 N. What is the net force on the rope?

• 40 N to the right

• 40 N to the left

• 800 N upward

• 800 N downward

A student ties a string to a box. The student pulls on the string to accelerate the box upward. Which of the following force diagrams illustrates the forces acting on the box?

• A.

• B.

• C.

• D.

A book is dropped and falls to the floor. Which of the following describes the forces between the book and the floor when the book hits the floor?

• The book exerts a force on the floor, but the floor does not exert a force on the book.

• The book does not exert a force on the floor, but the floor exerts a force on the book.

• The force exerted by the book on the floor is greater in magnitude than the force exerted by the floor on the book.

• The force exerted by the book on the floor is equal in magnitude to the force exerted by the floor on the book.

What is the net force that acts on a 5 kg object accelerating at 2 m/s²?

• 2.5 N

• 5 N

• 10 N

• 50 N

Which of the following is an example of an object that could have a net force greater than zero acting on it?

• a glass resting on a table

• a ball rolling down a ramp

• a ladder leaning against a wall

• a toy car moving east at a constant velocity

The diagram below represents a block sliding across a table at a constant speed. All forces are shown except the frictional force. What is the magnitude of the frictional force on the block?

• 0.8 N

• 1.6 N

• 1.7 N

• 2.5 N

The graph shows the acceleration of a 5 kg object over time. What is the net force acting on the object?

• 0.4 N

• 2.0 N

• 2.5 N

• 10.0 N