Unit 3 Forces and Motion

What force is needed to keep a heavy box sliding at constant speed?

• Gravity

• Friction

• Thrust

• Magnetism

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What does friction do?

• Helps objects move faster

• Opposes motion

• Increases speed

• Creates energy

What is thrust?

• The force that pulls objects down

• The force that pushes a rocket upward

• The force that stops motion

• The force of friction

What must thrust overcome for a rocket to ascend?

• Wind

• Friction

• Gravity

• Mass

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What does a steeper slope on a distance vs. time graph indicate?

• The object is stopped

• The object is moving slowly

• The object is moving fast

• The object is moving in a circle

What does a flat line on the graph represent?

• The object is moving

• The object is stopped

• The object is accelerating

• The object is falling

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What does the gravitational force between two objects depend on?

• Their speed

• Their masses

• Their colors

• Their shapes

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How does distance affect gravitational pull?

• Closer objects have a weaker pull

• Closer objects have a stronger pull

• Distance has no effect

• Only mass matters

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If a toy moves at a constant speed of 1 cm every second, how far will it travel in 5 seconds?

• 2 cm

• 5 cm

• 10 cm

What affects the strength of gravitational forces between objects?

• Their color

• Their distance and mass

• Their shape

• Their temperature

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