Unit 2 Exp. 1 Types of Forces

A push or a pull on an object is a

• force

• energy

• motion

• mass

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A type of force that is in direct contact with each other such as friction, applied force, and normal force is called a

• contact force

• noncontact force

• magnetic force

• normal force

Which type of force does not require objects to be in direct contact?

• A) Contact force

• B) Non-contact force

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_________________ is a contact force between two surfaces when they push or rub against each other. It is parallel to the surfaces and opposes their motion.

• Friction

• Gravity

• Magnetism

• Normal force

Order the different surfaces from greatest friction(3) to least friction (1); Gravel, wood, ice.

• gravel surface = 3, wooden floor = 2, ice = 1

• gravel surface = 1, wooden floor = 2, ice = 3

• gravel surface = 2, wooden floor = 3, ice = 1

• gravel surface = 1, wooden floor = 3, ice = 2

What is gravity?

• A) A contact force that pushes objects apart

• B) A non-contact force that pulls objects with mass toward each other

• C) A force that only affects planets

• D) A force that increases with distance

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Gravitational force is affected by the ______ of the objects and the distance between them.

• mass

• color

• shape

• temperature

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The greater an object's mass, the greater the gravitational force between it and other objects.

• True

• False

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Gravitational force ______ as the distance between two objects increases.

• increases

• decreases

• stays the same

• disappears

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A force exerted by some metals materials that attracts or repels objects. It is a non-contact force.

• Magnetic

• Gravity

• normal

• applied

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