Gravity and Friction

Gravity and Friction

Fill in the Blank

Gravity is a force that pulls objects _________________________ each other.

Multiple Choice

Two toy race cars are going to be raced down the same ramp. Which information is most helpful in predicting which car will win the race?

• volume of the cars

• length of the ramp

• mass of the cars

• slope of the ramp

Multiple Choice

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble would remain at constant speed.

• The marble’s speed would increase.

• The marble’s speed would decrease.

Multiple Choice

John stands at the top of a steep hill and pushes a ball over the edge with his foot. Which force causes the ball to continue rolling down the hill?

• mass

• gravity

• friction

• air resistance

Multiple Choice

True or False:

The rocky road will decrease the speed of the ball because of friction.

• True

• False

Multiple Choice

Why is it important for basketball players to wear shoes with tread when playing?

• to increase the speed of the player

• to decrease the force between the player and the floor

• to decrease the amount of force needed for the player to move

• to increase friction between the floor and the player’s feet

Multiple Choice

Lilly has a flat piece of paper and a ball of paper. She drops both papers at the same time from the same height. The ball of paper hits the ground first. Which force acts on the flat piece of paper that slows it down?

• friction

• gravity

Multiple Choice

Which parachute was moving faster?

Multiple Choice

Which parachute is moving slower because there is more air resistance?

Multiple Choice

True or False:

A skydiver jumps from an airplane with a parachute. Gravity pulls her down and friction slows her fall.

• False

• True

Multiple Choice

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 fly.