Using Forces to Predict Motion: Mastery Test

Select the correct answer. What was Galileo’s contribution to the study of motion?

• He developed the three laws of motion.

• He was the first to systematically study force and motion.

• He was the first to discover gravity.

• He improved on Newton’s laws.

Select the correct answer. Which kind of force do you exert on an object when you pull it toward you?

• applied force

• attractive force

• drag force

• normal force

Select the correct answer. Tonya picks up a leaf from the ground and holds it at arm’s length. She lets go, and the leaf falls to the ground. What force pulled the leaf to the ground?

• applied force

• drag force

• gravitational force

• normal force

Select the correct answer. Lucas rubs a plastic ruler on his sweater. He waves the ruler above a pile of shredded paper and notices that the pieces of paper get attracted to the ruler. Which attractive force is responsible for this?

• tension force

• normal force

• magnetic force

• electric force

Select the correct answer. Ethan pushes a wooden box across a carpeted floor. Then he pushes the same box across a smooth marble floor. Why does Ethan find it easier to push the box on the marble floor than on the carpeted floor?

• The box experiences more friction on the marble floor.

• The box experiences less friction on the marble floor.

• The box experiences more applied force on the marble floor.

• The box experiences less normal force on the marble floor.

Select the correct answer. Which statement about forces is true?

• Forces are defined by strength but not direction.

• Forces are defined by direction but not strength.

• Forces are defined by both strength and direction.

• Forces act only on objects that are in contact.

Select the correct answer from each drop-down menu. A box is at rest on a table. What can you say about the forces acting on the box? The upward applied force, frictional force, and the downward drag force are balanced.

(a)  

• Normal force
• Gravitational force

• Magnetic force

• Electrostatic force

• Tension force

Select the correct answer from the drop-down menu. Maurice pulls on the end of a spring scale. He lets go of the end and observes the spring snap back into place. What force restores the spring to its original shape?

(a)  

• Elastic
• Gravitational

• Frictional

• Magnetic

Select the correct image. Mathew is simulating forces on a simple machine. He runs four tests as shown. Which test illustrates a balanced net force?