Friction, Gravity, Energy

Friction is....

• a force that opposes an object's motion.

• a force that works in the same direction as an object's motion.

• not a force.

• a pulling force.

An example of sliding friction is...

• a person riding a bicycle

• a person sledding down a snowhill

• a football flying through the air

Which of the following is NOT an example of fluid friction?

• a person swimming in a pool

• a parachute falling through the air

• a football flying through the air

• a skateboard rolling down a sidewalk

A water bottle sitting, not moving on a table is an example of

• rolling friction

• fluid friction

• sliding friction

• static friction

Which of the following is NOT a type of kinetic (moving) friction?

• static

• rolling

• sliding

• fluid

What two factors does the strength of gravity depend on?

• mass and distance

• mass and time

• distance and speed

• acceleration and mass

If you dropped two cubes with different masses (same size and shape), the cubes will land on the ground at the same time.

• True

• False

Mass is a measure of how much ___________ is in an object.

• matter

• time

• distance

Weight is a measure of the gravitational pull exerted on an object.

• True

• False

Mass and weight are the same thing.

• True

• False