Unit 4E: Friction

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# Unit 4E: Friction - PowerPoint PPT Presentation

Unit 4E: Friction. Friction. T. Unit 4E: Vocabulary. U seful Words. Friction. A force acting between two surfaces. Air resistance. Friction caused by a body moving through air. Water resistance. Friction caused by a body moving through water. Forcemeter.

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Unit 4E: Friction

Friction

T

Unit 4E: Friction

Unit 4E: Vocabulary

Useful Words

Friction

A force acting between two surfaces

Air resistance

Friction caused by a body moving through

air

Water resistance

Friction caused by a body moving through

water

Forcemeter

A piece of equipment for measuring force

Newtons

The units in which force is measured

Surface area

The face of a body

V

Unit 4E: Vocabulary-

Unit 4E: Forcemeters

3Newtons

7Newtons

5Newtons

8.5 Newtons

A

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!

A

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

Unit 4E: Forces against movement

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

D

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

Unit 4E: Forces against movement

D

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

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

I

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.

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

Unit 4E: What is this force?

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Unit 4E: Forces against movement: 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?

D

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

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.

A

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

Unit 4E: Water Resistance

movement

water

D

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

Unit 4E: Air Resistance

movement

air resistance

D

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

brakes

ice skates

Rough: high friction

Smooth: low friction

tyres

slide

goalkeeper’s

gloves

Force between

moving solid surfaces

drawers

Friction: a force

Air resistance-force on an object

moving through air

Water resistance-

force on an object

moving through water

Non streamlined:

High resistance

Big area:

High

resistance

Streamlined:

Low resistance

submarine

parachute

streamlined car

fish

sail (boat)

dart

person walking

through water

boat

Unit 4E: Summary

Small area:

Low resistance

S