force & motion quiz part 1

A girl is playing with a basketball. The girl throws the basketball on the ground one time, it bounces back in the air, & then falls down again. Why does the basketball come down again after it bounces into the air?

• It is pushed down by air.

• It is pulled down by gravity.

• It is attracted by the material of the road.

• It is pushed away by the material of her shoes.

When someone throws a ball into the air, why does it begin to fall back down to the ground?

• The ball loses mass as it begins to fall back to the ground.

• The force of friction pulls the ball toward the ground.

• The force of gravity pulls the ball toward the ground.

• The ball gains mass and begins to fall back to the ground.

Which best describes the pull of the Earth's gravity on objects?

• It pushes objects away from the Earth in all directions.

• It pulls them from the North Pole to the South Pole.

• It pulls them from the South Pole to the North Pole.

• It pulls them towards them towards the center of the Earth.

Dan observes that when a hockey puck is pushed by a hockey stick, the puck moves quickly on an icy surface, but gradually looses speed & comes to rest. What explains Dan's observation?

• The hockey puck runs out of force.

• The hockey puck is too small to keep moving.

• The force of friction on the hockey puck slows it down.

• The force of gravity opposes the motion of the hockey puck.

Emily kicks a soccer ball & it gradually rolls to a stop. What causes the ball to come to a complete stop?

• friction

• inertia

• momentum

• unbalanced force

A student rolls a marble with equal force on a concrete sidewalk, a hardwood floor & a grassy lawn. Which would likely show the distances in meters that the marble rolled on each surface after 5 seconds?

• concrete sidewalk 1.2

  hardwood floor 0.8

  grassy lawn 1.9

• concrete sidewalk 1.2

  hardwood floor 1.2

  grassy lawn 1.2

• concrete sidewalk 0.8

  hardwood floor 0.8

  grassy lawn 1.2

• concrete sidewalk 1.2

  hardwood floor 1.9

  grassy lawn 0.8

The diagram shows 4 positions of a cart traveling on a track. Th e cart was moving a constant speed just before it got to point A. At which point would the car most likely be moving at its fastest speed?

• point A

• point B

• point C

• point D

What force is most responsible for pulling the object up the ramp?

• friction

• gravity

• inertia

• momentum

Which term can define the rate at which something moves?

• direction

• friction

• gravity

• speed

A toy car was given an initial push, then traveled a short distance before stopping. Why did the toy car stop?

• Friction was an unbalanced force that caused the car to slow down and stop.

• The force absorbed by the car was used up as it traveled on its path.

• The force pushing the car was removed, and inertia made it stop.

• The force of friction started acting on the car after it moved a certain distance.