Unit 3 Test Review

Which investigation could help you measure the strength of a magnet?

• Counting how many paper clips the magnet can hold.

• Seeing if the magnet sticks to a wooden block.

• Observing if a magnet floats in water.

• Checking if magnets work better in cold weather.

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What happens when a powerful magnet pulls on a weaker magnet?

• Both magnets attract each other with the same amount of force.

• The powerful magnet exerts more force than the weaker one.

• Only the powerful magnet applies force.

• There is no force between them.

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A metal ball rolls toward a magnet and speeds up. What causes the ball to accelerate?

• Gravity increases near the magnet.

• The magnet applies a force that pulls the ball.

• The ball’s mass increases.

• Friction decreases near the magnet.

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Which setup best demonstrates magnetic repulsion?

• A magnet sticks to a refrigerator.

• Two magnets float apart when you try to push them together.

• A magnet attracts iron filings.

• A nail becomes magnetized.

A rock falls off a cliff. Which forces are acting on it as it falls straight down?

• Only air resistance.

• Gravity and air resistance.

• Only gravity.

• Gravity and friction from the ground.

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A soccer ball is kicked upward. What force slows it down as it rises?

• Gravity.

• Air pressure pushing it up.

• Friction from the grass.

• Magnetism.

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A book rests on a table without moving. What are the forces at work?

• Only gravity pulling it down.

• Gravity pulling it down and the table pushing it up with equal force.

• Gravity pulling it down and friction pushing it sideways.

• Only the table pushing it up.

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A moving skateboard comes to a stop because:

• Friction between the wheels and ground slows it down.

• Gravity pulls it backward.

• The wheels apply a forward force.

• It loses its mass.

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A sled slides across ice and slows down. Why?

• Air resistance increases.

• Friction between the sled and ice slows it down.

• Gravity stops acting on it.

• The sled’s mass decreases.

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A car moves at a constant speed of 60 mph. Which statement is true?

• The forces are balanced.

• There’s an unbalanced force making it speed up.

• Gravity is the only force acting on it.

• There’s no friction acting on the car.