Which investigation will best test the effects of gravity on moving objects?

• pencils falling from the same height

• balloons floating upward from the same height

• a bicycle speeding up on a flat surface

• a ball slowing down on a flat surface

A man is pushing a ball up a hill. If the man stops pushing the ball and steps out of the way, what will most likely happen to the ball?

• It will stop on the hill.

• It will roll down the hill.

• It will roll to the side toward the man.

• It will continue to roll up the hill.

Which best describes the role friction plays in the operation of a car?

• Friction makes a car go faster.

• Friction keeps a car from stopping.

• Friction turns the car in a new direction.

• Friction helps a car slow down and stop.

Carey left a bowling ball and kickball outside on a windy day. Which best explains why the kickball moved but the bowling ball did not?

• The kickball has less mass so it was easier to move.

• The force of gravity acting on the bowling ball is greater.

• The mass of the kickball is greater so it is easier to move.

• The force of gravity acting on the kickball is greater.

Jim played ice hockey with his friends. When he hit the puck, it stopped before reaching the goal. Which most likelycaused this to happen?

• mass

• friction

• gravity

• momentum

Four cars are at the starting line of a race. Which car will require the most force to start moving?

• car with mass of 1200 kilograms

• car with mass of 1500 kilograms

• car with mass of 1700 kilograms

• car with mass of 2000 kilograms

Adrian makes a ramp out of some books and a plank of wood. He can change the height of the ramp by adding books under the plank. He rolls a toy car down each ramp. At the bottom of which ramp would the car be traveling the fastest?

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A student uses a rubber band to launch the four objects shown in the table.

paper clip .5 grams

piece of paper 1 gram

eraser 2 grams

rubber ball 10 grams

If the student pulls the rubber band back the same amount each time, which object will most likely move the fastest when launched?

• paper clip

• paper

• eraser

• rubber ball

A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop?

• gravity acting on the wagon

• friction acting on the wagon

• the mass of the wagon

• the mass of the child

Four solid balls, each with different mass, are moving at the same speed. Which ball would require the most force to stop its motion?

• 5 kg

• 10 kg

• 15 Kg

• 20 Kg