Forces and Motion

What is the average speed in kilometers per hour

• 40 mp/h

• 60 km/h

• 40 km/h

• 10 m/s

the tendency of an object to resist a change in its motion

• acceleration
• inertia
• mass
• frame of reference

Which force produces a change in motion?

• unbalanced force
• balanced force
• gravitational force
• frictional force

Which type of force resists motion?

• Friction

• Gravity

• Pull

• Push

What happens in a game of tug-a-war when both teams pull the rope with equal force and in opposite directions?

• The rope does not move

• Both teams move to the right

• Both teams move to the left

• Both teams fall down

A fifth grade class has a model car race. The students were divided into 4 groups. Each group built a model car for the race. Below are the results of the race.

Which car won the race?

• Car 1

• Car 2

• Car 3

• Car 4

The model shows forces acting on a box when it is sliding down the ramp.

What would most likely happen to the motion of the box if you poured oil on the ramp?

• It will slow the box because the force of friction will be increased.

• It will speed up the box because the force of friction will be increased.

• It will slow the box because the force of friction will be reduced.

• It will speed up the box because the force of friction will be reduced.

A student performed an investigation to test the hypothesis that increasing the force on an object would increase the speed. She put different forces on the same object and measured the time it would take to travel 5 meters. Shown is a chart with her data.

Did the results support her hypothesis?

• Yes, because more force reduced the time needed to travel 5 meters, so it was going faster.

• Yes, because more force reduced the time needed to travel 5 meters, so it was going slower.

• No, because more force reduced the time needed to travel 5 meters, so it was going faster.

• No, because more force reduced the time needed to travel 5 meters, so it was going slower.

How can you increase the acceleration of an object?

• decrease its mass
• increase its friction
• increase its mass
• decrease the force applied to it

It takes more force to accelerate the iron man on the left than the iron man on the right because the iron man on the left has more mass. This best describes

• Newton's first law, the law of inertia
• Newton's second law, the law of acceleration
• Newton's third law, the law of action reaction 
• The law of universal gravitation