Force and Motion Review

How can you increase the speed of a race car?

• by decreasing the mass of the car

• by increasing the mass of the car

• by increasing the force of friction

On which surface will a toy car travel the fastest?

• a track sloping upward

• a track that is completely flat

• a track sloping gently downward

• a track sloping steeply downward

Which best represents the relationship between force and the mass of an object?

• The greater the force, the smaller the object

• The small the force , the small the object

• The force on an object determines what density it has

• The greater the mass of an object, the greater the force needed to move it

• A

• B

• C

• D

A roller coaster is shown below. The cart of passengers was at the top of the loop, on the way down, when the ride stopped. How is gravity acting on the passengers in the cart?

• gravity is keeping the passengers in the cart

• gravity is pulling the passengers straight down

• gravity is pulling the passengers in the direction of the roller coaster

Sometimes machines are used to lower heavy objects from the top of a building to the ground. Which is most responsible for making the object move to the ground?

• wind

• gravity

• friction

• momentum

Which is the best explanation of why the Moon revolves around the Earth?

• The Moon has a thinner atmosphere than Earth

• The Moon is too large to move away from Earth

• The Moon is attracted by gravity to the Earth

• The Moon has smaller gravitational force than the Earth

The gravitational force of the Sun is strong enough to hold all the planets of the solar system in orbit many millions of miles away. Which BEST describes why objects have far less mass on the surface of these planets are not pulled off and into the sun?

• The objects have too little mass to be affected by the Sun

• The objects are held by the greater combined gravity of all the planets

• The objects are more strongly affected by the gravity of the planet on which they are found

A model truck travels 20 meters in 15 seconds. How many meters will it travel in 45 seconds?

• 0.4 m

• 25 m

• 30 m

• 60 m

The table shows the results when several students ran a 500-meter race. Which student ran the race the fastest?

• Daniel

• Maria

• Sally

• Tyler