Unit 4E: Friction

Unit 4E: Friction

Unit 4E: Friction

Friction

Unit 4E: Vocabulary-

Unit 4E: Vocabulary

Useful Words

A force acting between two surfaces

Friction caused by a body moving through air

Friction caused by a body moving through water

A piece of equipment for measuring force

The units in which force is measured

The face of a body

Friction

Air resistance

Water resistance

Forcemeter

Newtons

Surface area

Unit 4E: Forcemeters : L.O. 1,2 : NC. 4.2e

Unit 4E: Forcemeters

3 Newton

s

7 Newton

s

5 Newton

s

8.5 Newtons

Unit 4E: Forcemeters : L.O. 1,2 : NC. 4.2e

Unit 4E: Using Forcemeters

Try hanging different objects fromaround the classroom on the forcemeter.

Write down the readings

you get!

ObjectForcemeter reading in Newtons

Unit 4E: Forces against movement: L.O. 3 : NC. 4.2d

Unit 4E: Forces against movement

This picture shows the same box being pushed on different surfaces.

Unit 4E: Forces against movement: L.O. 3 : NC. 4.2d

Unit 4E: Forces against movement

Unit 4E: Investigation : L.O. 4, 5, 6, 7, 8 : NC. 1.1b; 1.2d, e, f, g, h, j

Unit 4E: Investigation

Investigation: Which surface do objects slide on most easily?

Which of these surfaces will a weighted box slide across most easily?

A) VinylB) WoodC) Carpet

When you have chosen, explain why you think this surface will be the easiest to slide across

Unit 4E: Investigation : L.O. 4, 5, 6, 7, 8 : NC. 1.1b; 1.2d, e, f, g, h, j

Unit 4E: Investigation (cont.)

Investigation: How are you going to test this?

“What variable are you testing? (the thing that changes)”

“What variable will you change?”

“What variables will remain the same to make it a fair test?”

“What will you measure?”

Record the results as a bar chart, ask for help if you’re unsure.

Unit 4E: Forces against movement: L.O. 3 : NC. 4.2d

Unit 4E: What is this force?

Unit 4E: High and Low Friction: L.O. 3 : NC. 4.2d

Unit 4E: High and Low Friction

Is it best for each of the following to have high or low friction?

Situation High Friction Low friction

Tyres on a car

Playground slide

Goalkeeper’s gloves

Shoe laces

A drawer

Ice skates

Climbing rope

Unit 4E: Water Resistance: L.O. 11, 12 : NC. 4.2 c, d

Unit 4E: Water Resistance

Which shape do you think will travel through the water the quickest?

Why do you think this one will be the quickest?

Test different shapes to see how quickly they move through the liquid.

Unit 4E: Water Resistance: L.O. 13 : NC. 4.2 c, d

Unit 4E: Water Resistance

water movement

Unit 4E: Air Resistance: L.O. 13 : NC. 4.2 c, d

Unit 4E: Air Resistance

movement air resistance

boat

fish

submarine

person walkingthrough water

parachute

sail (boat)

streamlined car

dart

Non streamlined:

High resistance

Streamlined:

Low resistance

Small area:Low resistanceBig area:

High

resistance

drawers

ice skates

slide

goalkeeper’s

gloves

brakes

Rough: high friction

Smooth: low friction

Unit 4E: Summary

Force betweenmoving solid surfaces

tyres

Water resistance-force on an object

moving through water

Air resistance-force on an objectmoving through air

Friction: a force