# KS2 Science Quiz - Forces 02 (Questions)

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.

1. What effect does air resistance have on a falling object?
 [ ] It causes the falling object to speed up [ ] It pushes the falling object sideways [ ] It has no effect [ ] It slows the falling object down
2. Why do trainers have rough-textured soles?
 [ ] Rough-textured soles make trainers more 'slippery' [ ] No one wants shoes which don't leave interesting footprints [ ] Rough-textured soles help trainers to 'grip' surfaces better [ ] People like to show off their shoe soles
3. If an object is stationary (not moving), what are the forces acting on it?
 [ ] The forces are balanced [ ] The forces are unbalanced [ ] The forces are moving [ ] The forces are unmoving
4. What forces are exerted by magnets?
 [ ] Pushes [ ] Pulls [ ] Pushes and pulls [ ] Neither pushes nor pulls
5. Which of these objects is designed to have low friction?
 [ ] Skis [ ] Car tyres [ ] Bicycle brakes [ ] Carpet
6. When a bowl is sitting on a table, which forces are said to be 'balanced'?
 [ ] Gravity and air resistance [ ] Upthrust and gravity [ ] Friction and magnetism [ ] Magnetism and air resistance
7. What does friction cause?
 [ ] Wind [ ] Upthrust [ ] Heat [ ] Gravity
8. 'Compressing' a spring means which of these?
 [ ] To push it inwards [ ] To pull it outwards [ ] To tie it into a knot [ ] To send it down the stairs
9. Different Newtonmeters are used to measure different amounts of force. A Newtonmeter designed to measure large forces will have what type of spring?
 [ ] A long, thin, very flexible spring [ ] A thick spring that is very stiff [ ] A short, but very flexible spring [ ] No spring
10. Which of these would not be a result of applying force to a material?
 [ ] The material is stretched [ ] The material is compressed [ ] The material is twisted [ ] The material is changed into a new material

KS2 Science Quiz - Forces 02 (Answers)
1. What effect does air resistance have on a falling object?
 [ ] It causes the falling object to speed up [ ] It pushes the falling object sideways [ ] It has no effect [x] It slows the falling object down
Parachutes work by maximising air resistance
2. Why do trainers have rough-textured soles?
 [ ] Rough-textured soles make trainers more 'slippery' [ ] No one wants shoes which don't leave interesting footprints [x] Rough-textured soles help trainers to 'grip' surfaces better [ ] People like to show off their shoe soles
Rough surfaces give much better 'grip' than smooth ones
3. If an object is stationary (not moving), what are the forces acting on it?
 [x] The forces are balanced [ ] The forces are unbalanced [ ] The forces are moving [ ] The forces are unmoving
Balanced forces are equal forces acting in opposite directions
4. What forces are exerted by magnets?
 [ ] Pushes [ ] Pulls [x] Pushes and pulls [ ] Neither pushes nor pulls
Magnets can attract (pull) and repel (push) objects
5. Which of these objects is designed to have low friction?
 [x] Skis [ ] Car tyres [ ] Bicycle brakes [ ] Carpet
Brakes and tyres are designed to have high friction, so as to slow the bike down and give it grip
6. When a bowl is sitting on a table, which forces are said to be 'balanced'?
 [ ] Gravity and air resistance [x] Upthrust and gravity [ ] Friction and magnetism [ ] Magnetism and air resistance
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
7. What does friction cause?
 [ ] Wind [ ] Upthrust [x] Heat [ ] Gravity
You can rub your hands together to warm them up. The friction causes heat
8. 'Compressing' a spring means which of these?
 [x] To push it inwards [ ] To pull it outwards [ ] To tie it into a knot [ ] To send it down the stairs
Compressing is the opposite of stretching
9. Different Newtonmeters are used to measure different amounts of force. A Newtonmeter designed to measure large forces will have what type of spring?
 [ ] A long, thin, very flexible spring [x] A thick spring that is very stiff [ ] A short, but very flexible spring [ ] No 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
10. Which of these would not be a result of applying force to a material?
 [ ] The material is stretched [ ] The material is compressed [ ] The material is twisted [x] The material is changed into a new material
Forces can change the shape of a material, but not what it is!