POTU - Fall Semester Final Exam Part 2

According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will

• remain in motion.
• eventually come to a stop.
• change its momentum.
• accelerate.

A sled sliding on a flat, icy surface with a constant velocity is best described by

• Newton’s first law of motion for objects at rest.
• Newton’s first law of motion for objects in motion.
• Newton’s second law of motion.
• Newton’s third law of motion.

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.
• Every mass exerts a force on every other mass.
• An object at rest tends to stay at rest.
• Friction opposes the motion of an object.

Which of the following is an example of an unbalanced force?

• A book resting on the table.

• A pencil that is knocked to the ground.

Which of the following is an example of balancing forces?

• A Book resting on the table.

• A pencil is knocked off the desk.

A push or a pull is called a

• Gravity

• Force

What is Newton's 1st Law?

• For every action there is an equal and opposite reaction.

• An object at rest will stay at rest, an object in motion will stay in motion, unless an unbalanced force acts upon it.

What is Newton's 2nd Law?

• For every action there is an equal and opposite reaction.

• Acceleration depends on two variables, the mass of the object and the amount of force.

What is Newton's 3rd Law?

• For every action there is an equal and opposite reaction.

• Acceleration depends on two variables, the mass of the object and the amount of force.

What explains why objects resist changes in their state of motion?

• gravity

• inertia

• force

• friction