Balancing Forces Chapter 3 Quiz

When force brings an object closer, that is a

• pull

• push

• pull and push

• repel

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Which of these objects are exerting touching forces on each other?

• Earth in orbit around the sun

• a leaf falling to the ground

• a bicycle rolling past a wall

• a bat hitting a baseball

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A bike is parked on the sidewalk. The kickstand keeps the bike from falling over. What can you tell about the kickstand?

• The sidewalk and the kickstand are not in contact.

• The bike is not leaning on the kickstand.

• The sidewalk and the kickstand are exerting forces on each other.

• The kickstand and the bike are unbalanced forces.

If a magnet attracts an object, it_____.

• pushes it away

• pulls it in

• does not like it

• repels it

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The pull of gravity refers to____?

• touching force

• magnetic force

• weight

• pushing

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Lisa places two magnets 4 cm apart. The magnets repel each other. Next she moves the magnets 8 cm apart. Then the magnets do not move. What question is Lisa trying to answer?

• Does the size of a magnet affect its strength?

• Does the force between two magnets change with distance?

• Does gravity increase when magnets are further apart?

• Does the shape of a magnet affect its strength?

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In which of the tug of war contests would the dog win?

• elephant vs dog

• dog vs dinosaur

• dog vs horse

• dog vs mouse

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Scientists of all kinds make diagrams to show their ideas.

• true

• false

Gravity can make objects roll down a slope as well as make objects fall straight down.

• true

• false

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An object falls because Earth pulls the object toward it with the force of ______.

• magnetism

• pushing

• gravity

• touching force

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