Gravity and Friction

Which of the following is an example of gravity at work?

• A. A balloon floating in the air

• B. A book falling off a table

• C. A toy car moving on its own

• D. A paper airplane gliding forward

What would happen if there were no gravity?

• A. Objects would remain in place.

• B. Everything would float away.

• C. Objects would move faster downward.

• D. Friction would increase on surfaces.

What happens when friction is increased?

• A. Moving objects slow down faster.

• B. Objects become weightless.

• C. Surfaces become smoother.

• D. Gravity becomes weaker.

Which type of surface would create the least friction?

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Which factor affects how much friction occurs between two objects?

• A. The color of the objects

• B. The roughness of their surfaces

• C. The weight of the person using them

• D. The height from which they fall

Gravity is stronger on objects with greater mass.

• True

• False

Friction can help objects move by providing grip.

• True

• False

An object in motion will never stop unless gravity acts on it.

• True

• False

Gravity exists only on Earth.

• True

• False

Friction is necessary for walking because it prevents slipping.

• True

• False