Why would a rolling or bouncing ball come to a stop?

# Forces - Friction and Gravity

This quiz addresses the requirements of the National Curriculum KS1 Science for children aged 5 and 6 in years 1 and 2. Specifically this quiz is aimed at the section dealing with the forces of friction and gravity.

Do you know how forces affect speed and going faster? What about forces slowing things down and stopping them? We stop cars and bikes by using friction. When you throw a ball up into the air, what happens? Why does it not just keep going up for ever? Because of gravity! Let’s find out a bit more about how things move, and how they stop through friction and gravity.

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1. Mr Smith is driving a car. He comes up to some traffic lights. The traffic lights are on red. What must Mr Smith do?
Always stop at red traffic signals
2. The tennis player throws the ball into the air. What happens to the ball?
The tennis player is serving. Do you play tennis?
3. Jack is sat in a wooden box. His friend tries to push Jack across the ground in the box. But it is very hard work. The box hardly moves. Why is it so hard to make the box move?
The ground is rough. There is a lot of friction. The friction stops the box moving
4. This boy is on rollerblades. He is braking. He is:
How do you slow down on a bike?
5. Which of these have to have brakes?
Going faster is all very well, but you have to be able to stop!
6. Sam is at a crossing. The red man is showing. What does the red man mean?
Never cross the road when the red man is showing. Wait for the green man
7. A car comes to a stop. When the car has stopped it is:
Have you ever been told to ‘stop what you are doing’?
8. Why is this such hard work?
It is always hard to push things uphill
9. The rugby player is kicking the ball. What happens to the ball?
Have you ever played mini tag rugby?
10. This man is on a mountain bike. He is coming down a hill. He does not want to go too fast. What should he do?
What must you wear when you are on a bicycle? - A helmet

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