7.1: Kinds of Forces

Which force will eventually stop a rolling ball from moving?

• friction

• electricity

• magnetism

• inertia

On a cold morning, Ava waited for the bus. Ava’s hands were cold so she rubbed them together to warm them. Which force helped Ava warm her hands?

• electricity

• gravity

• friction

• tension

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What type of forces is used to kick a ball into the air?

• electrical

• magnetic

• gravity

• push

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Which statement best describes how the gravitational attraction between objects is related to distance?

• Gravitational attraction increases as the objects get farther apart.

• Gravitational attraction decreases as the objects get farther apart.

• Gravitational attraction remains constant as objects get farther apart.

• Gravitational attraction and distance apart are unrelated to each other.

If two opposite forces act on a stationary object at the same time, and one pushes up with 15 newtons and the other pushes down with 9 newtons, which way will the object move?

• It will not move.

• It will move up.

• It will move left or right.

• It will move down.

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When two forces are working on an object and it does not move....

• The forces are balanced

• The forces are unbalanced

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Gravitational pull is affected by

• friction

• mass

• distance

• force

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An example of a non-contact force is:

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