Forces and Friction Concepts

What makes a bike slow down when you use the brakes?

• Air

• Friction

• Speed

• Light

What is a force that pushes against something to slow it down?

• Gravity

• Push

• Friction

• Pull

Where can you find friction?

• Only in the air

• Only in water

• Where two surfaces rub together

• Only when things are very fast

Why is it hard to roller skate on grass?

• Grass is too soft.

• Grass makes more friction.

• Grass is too smooth.

• Grass is too green.

What happens when you rub your hands together to get warm?

• Your hands get colder.

• Your hands get wet.

• Friction turns motion into heat.

• Your hands get sticky.

What is the force that pulls things down to the center of the Earth?

• Friction

• Push

• Gravity

• Wind

Why can astronauts jump higher on the Moon than on Earth?

• The Moon is bigger than Earth.

• The Moon has more gravity.

• The Moon has less gravity.

• Astronauts are stronger on the Moon.

What would happen if there was no gravity on Earth?

• We would all float in the air.

• We would all stick to the ground.

• We would be able to fly.

• We would be able to run faster.

Can you see or touch gravity?

• Yes, you can see it.

• Yes, you can touch it.

• No, but it is always there.

• Only if you are an astronaut.

What happens to a ball you throw up into the sky because of gravity?

• It stays in the sky forever.

• It flies away into space.

• It gets pulled back down to the ground.

• It changes color.