3rd Grade Ch. 3 and 5 Science Periodic

When can light energy from the sun be harmful?

• when it helps plants grow

• when it causes pollution

• when it causes sunburns

Which material gives off energy when burned?

• fuel

• light

• rock

Which surface produces the greatest amount of friction?

• ice

• sandpaper

• glass

Which is an example of a force acting at a distance?

• a boy hitting a soccer ball

• a rock falling down to Earth's surface

• a sled slowing down as it slides

What happens when a large force acts on a small still object?

• the object slows down

• the object moves

• the object stops

A shopping cart is standing still. What is needed to get it moving?

• a distance

• a direction

• a force

Which of the following is a natural magnet?

• a compass

• a horseshoe

• a lodestone

A force that magnets apply to one another or to materials that are pulled by magnets is called

• magnetism

• friction

• gravity

A ball thrown up in the air will always fall down to the ground. What causes the ball to fall down?

• friction of the ball with the air

• gravity of Earth

• size of ball

A ball thrown up in the air will always fall down to the ground. Why does Earth pull the ball towards it?

• Earth has much more mass than the ball

• Earth has a lot of water

• Earth is round in shape