U1,L2 - Gravity & Friction Review

In science a force is

• easy to overcome.

• a push or a pull.

• equals motion.

• causes movement.

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Gravity is...

• Noncontact force.

• contact force

• gravitational force

• friction force

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The two ways that forces are described:

• acceleration and strength

• velocity and direction

• direction and strength

• happy and sad

Unbalanced forces acting on an object will change the object’s motion.

• true

• false

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Why is a magnetic force considered a noncontact force?

• Magnets must be far apart in order to exert a force.

• They do not have to touch each other to experience a force.

• They must be large so they have more force.

• Magnets push each other apart.

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When a golf ball and a baseball are dropped from a meter above the floor,

• the golf ball will hit first.

• the baseball will hit first.

• the object with the greatest mass will hit first.

• both hit at the same time.

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The force that pulls objects toward each other.

• gravity

• friction

• electricity

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Law of gravitation states that the force of gravity acts between ____objects in the universe.

• some

• metal

• all

• balanced

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What happens to the force of gravity between two objects if the distance decreases?

• increases

• decreases

The Earth orbits the sun because

• because forces are unbalanced.

• because it spins fast.

• because of gravity.

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