Forces and Motion

Which statement uses Newton's 3rd Law to describe a rocket launching into space?

• rockets with more mass require more force to launch

• rockets remain at rest until the force of the engine firing allows them to take off

• rockets move forward because the exhaust moves out of the back of the rocket

• rockets remain in motion as long as teh enfine is burning fuel

Answer explanation

Newton's Third Law says that for every action there is an equal and opposite reaction.

When playing a game of pool, he cue ball rolled almost to the target Michael wanted it to strike, then stopped. What most likely caused the cue ball to slow down?

• stability

• inertia

• momentum

• friction

A steam enjine and golf cart are both travelling the speed of 15mph. Both make a sudden stop. The golf cart stops instantly, but the train takes several seconds to come to a complet stop. Which is the best explanation?

• the golf cart has better brakes

• the driver of the the train wasn't paying attention

• the train steam engine has more mass

• the golf cart has more mass

Which law explains why the driver of a bike keeps going after the bike has stopped?

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• Newton's Law of Momentum

Examine the forces in the picture. Determine the outcome by calculating the net force on the rope.

• The net force is 2500N and the Green team will win

• The net force is 2200N and the Blue team will win

• The net force is 300N and the Green team will win

• The net force is 300N and the Blue team will win

Calculate the net force.

• 3N

  <-------

• 3N

  ------>

• 17N

  <--------

• 17N

  ------->

Two factors that affect the gravitaional force betwen 2 objects are?

• density and mass

• distance and density

• mass and weight

• mass and distance

Roller coasters throw your head back against the seat when they take off. Which law explains the car moves forward but your head is thrown backward?

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• Law of Inertia

Calculate the net force

• 8N to the right

• 8N to the left

• 5N to the right

• 2N to the right

The students at your school are taking a field trip to a science museum 154 miles away. If the school bus traveled 154 miles in 1.9 hours, what would be the speed of the school bus?

• 81 mph

• 292.6 mph

• 60 mph

• 71 mph