Gravity, air resistance and friction are the forces acting on a child going down a slide.

# Forces 03

Push and pull forces, such as magnetism or water resistance, are one of the main subjects studied in KS2 Science. This is the last in our set of of three quizzes looking at the different types, and the effects, of these push and pull forces, and it focusses on the forces at work in different situations.

You've learned about all the different forces which act on objects. Friction (which slows things down), gravity (which pulls things towards the Earth or other large body), magnetism (which attracts certain metals and repels opposite magnetic poles), air resistance and water resistance (which both drag on moving objects) - these are all different types of pushes and pulls. Now see if you can recognise which forces are in action in different situations.

Can you spot the forces at work? Is it magnetism or gravity, or could it be upthrust? Challenge yourself with this third and final science quiz about forces.

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1. Imagine someone cycling up a steep hill. Which forces are being experienced by the cyclist's shoes?
Gravity is always being exerted on objects, air resistance results from moving through the air, and friction results from the shoe's 'grip' on the pedals. The cyclist pushes down on the pedals (through the shoes) and pulls up after each push
2. Catapults are designed to provide a 'push' which will be stronger than the force of gravity - the object which is being catapulted should be aerodynamic to minimise which force?
Aerodynamic objects have less friction with the air and so are slowed less by air resistance
3. A child at the top of a slide is experiencing balanced forces. What force is needed to start the child sliding?
At the top of the slide gravity is countered by upthrust
4. What type of force is water resistance?
Water resistance slows things down, just like air resistance
5. Which forces are acting on a child who is going down a slide?
Gravity pulls the child downwards, friction from the slide and air resistance both slow the child down
6. A row boat being rowed across a lake is experiencing which forces?
The push comes from the rowing of the oars pushing the boat forwards through the water
7. What type of force is air resistance?
Air resistance and water resistance are both types of friction - air resistance is the friction an object experiences when moving through air and water resistance is the friction an object experiences when moving through water
8. What forces are acting on a parachute as it falls through the air?
Gravity pulls the parachute down and air resistance slows its fall
9. Which forces do the tyres on a moving bicycle experience?
Although it can be hard to imagine, the road is exerting upthrust on the bike's tyres - this is the force that prevents the bike from sinking through the road!
10. A toy plastic boat floating in a bucket of water is experiencing which forces?
Upthrust is the force that prevents the boat from sinking. All objects on Earth experience gravity all of the time

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