Newton's Laws

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 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.

A person in car slides to the right when going through a very sharp left turn on the highway.

• 1st Law

• 2nd Law

• 3rd Law

For every falling object, what is their acceleration due to gravity?

• 0 m/s^2

• 15 m/s^2

• 9.8 m/s^2

• 10.2 m/s^2

An 85kg football player tackles a 60 kg football player with a force of 23 N. Ouch! What force does the 60 kg football player exert on the larger player?

• 0 N

• 1.4 N

• 3.7 N

• 23 N

The earth pulls a book downwards with a force of 3N. How much force does the book exert on the earth?

• 0 N

• 9.8 N

• 3 N

• 29 N

A car is pushed forward, at a constant speed, with a force of 300 N. What is the acceleration of the car?

• 0 m/s^2

• Greater than 0

• Less than 0

A hammer hits the top of a nail, driving it into wood. Based on Newton's third law, what's the reaction force between the hammer and nail?

• The nail pushing into the wood

• The wood pushing against the nail

• The nail pushing back against the hammer

• Gravity's pull on both the hammer and the nail

A foot kicks a soccer ball. Based on Newton's Third Law, what's the reaction force as the foot kicks the ball?

• The ball accelerates forward

• The ball pushing back against the foot

• Air resistance against the ball

• Friction between the ball and the ground

A 12 N force is applied to a ball that weighs .6 kg. What is the ball's resulting acceleration?

• 20 m/s^2

• 7.2 m/s^2

• .05 m/s^2

• 12.6 m/s^2