3rd Grade Gravity and Magnetism

The diagram below shows a hill with several positions labeled.

Which of the following best explains how a force is acting on the ball?

• Gravity is pulling on the ball.

• Magnetism is pulling on the ball.

• Gravity is pushing on the ball.

• Air is pushing on the ball.

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A ball is dropped over a flat surface made of foam and the direction of the motion is represented by the arrow seen below.

Which of the following best explains why the motion of the ball is moving down. The ball is moving in the direction because …

• it is being pushed due to magnetism

• it is being pulled due to gravity

• it is being pushed due to the wind

• it is being pulled due to magnetism

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A group of third-grade students built a ramp using textbooks and a long, flat piece of wood. They measure how far one toy car went from the bottom of the ramp without being pushed. Each time they added one more textbook, but used the same toy car. The data they collected is shown in the table.

Increasing the number of books changes the motion of the toy car by…

• increasing the distance the toy car traveled due to gravity.

• decreasing the distance the toy car traveled due to gravity.

• increasing the distance the toy car traveled due to increasing the mass of the car.

• decreasing the distance the toy car traveled due to increasing the mass of the car.

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The picture shows a ball on a ramp.

What will cause the ball to roll down the ramp?

• The push of magnetism

• The heat of the Sun

• The pull of gravity

• The rotation of the Earth

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Which of the following objects could move a piece of iron without touching it?

• Magnet

• Spring scale

• Ruler

• Rubber band

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When you toss a ball into the air, gravity will pull the ball –

• to the left.

• to the right.

• toward the ceiling.

• toward the ground.

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All of these objects are moving in the direction of the pull of gravity EXCEPT –

• a rollercoaster going down a steep hill.

• a helium balloon rising into the sky.

• rain and sleet falling from a cloud.

• a rock sinking in a tank of water.

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What kind of objects will a magnet attract?

• plastic objects

• lead objects

• aluminum objects

• iron objects

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Which is FALSE about magnets?

• Magnets can attract or repel.

• Magnets only have one pole

• Magnets attract objects made of iron.

• Magnets can pull through solids and liquids.

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Why won’t a magnet attract a nail that is on the other side of the room?

• because the magnet’s magnetic field is not strong where the nail is

• because the magnet’s north pole is not facing the nail

• because the magnet repels objects that are far away

• because magnets do not attract iron objects

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