Skis are designed to have low friction.

# Forces 02

Children in KS2 will study forces such as gravity, thrust or friction. Whatever the force, it has either a push or a pull effect on objects around it. This is the second of three Science quizzes looking at the different types, and the effects, of these push and pull forces.

There are many types of force, such as thrust, magnetism and gravity. The famous scientist Galileo wanted to know whether gravity exerted the same force on all objects whatever their mass (the amount of matter an object contains). He dropped a cannonball and a small stone off the top of the tower of Pisa - and both hit the ground at the same time, showing that gravity always has the same force on all objects. Feathers only fall more slowly because of friction with the air. On the Moon a feather and a hammer fall at the same rate. Many people don't believe this until they try a similar experiment themselves.

See how much you know about gravity, friction and thrust by trying this quiz on the forces of push and pull.

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1. When a bowl is sitting on a table, which forces are said to be 'balanced'?
Without the 'upthrust' of the table, gravity would pull the bowl down (through the table)! When you look at a stationary object, such as the bowl, you can't see the balanced forces at work - but they are still there
2. What forces are exerted by magnets?
Magnets can attract (pull) and repel (push) objects
3. What effect does air resistance have on a falling object?
Parachutes work by maximising air resistance
4. Different Newtonmeters are used to measure different amounts of force. A Newtonmeter designed to measure large forces will have what type of spring?
A thick, stiff spring takes more force to stretch, allowing the Newtonmeter to measure greater forces. Newtonmeters designed for small forces will have thin, flexible springs
5. 'Compressing' a spring means which of these?
Compressing is the opposite of stretching
6. Which of these objects is designed to have low friction?
Brakes and tyres are designed to have high friction, so as to slow the bike down and give it grip
7. Why do trainers have rough-textured soles?
Rough surfaces give much better 'grip' than smooth ones
8. Which of these would not be a result of applying force to a material?
Forces can change the shape of a material, but not what it is!
9. What does friction cause?
You can rub your hands together to warm them up. The friction causes heat
10. If an object is stationary (not moving), what are the forces acting on it?
Balanced forces are equal forces acting in opposite directions

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