1. Unit 4E: Friction
Friction T
Unit 4E: Friction

2. Useful Words Friction A force acting between two surfaces
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-

3. Unit 4E: Forcemeters : L.O. 1,2 : NC. 4.2e
3 Newtons
7 Newtons
5 Newtons
8.5 Newtons A
Unit 4E: Forcemeters : L.O. 1,2 : NC. 4.2e

4. Unit 4E: Using Forcemeters
Try hanging different objects from around the classroom on the forcemeter Write down the readings you get!
Object
Forcemeter reading in Newtons A
Unit 4E: Forcemeters : L.O. 1,2 : NC. 4.2e

5. 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

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

7. I Investigation: Which surface do objects slide on most easily?
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) Vinyl B) Wood C) 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

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

9. Unit 4E: What is this force?D
Unit 4E: Forces against movement: L.O. 3 : NC. 4.2d

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

11. 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

12. Unit 4E: Water Resistance
movement
water D
Unit 4E: Water Resistance: L.O. 13 : NC. 4.2 c, d

13. Unit 4E: Air Resistance: L.O. 13 : NC. 4.2 c, d
movement
air resistance D
Unit 4E: Air Resistance: L.O. 13 : NC. 4.2 c, d

14. Air resistance- force on an object
Unit 4E: Summary
brakes
ice skates
Rough: high friction
Smooth: low friction
tyres
slide
goalkeeper’s
gloves
drawers
Force between
moving solid surfaces
Friction: a force
Air resistance- force on an object
moving through air
Water resistance-
force on an object
moving through water
Big area:
High
resistance
Non streamlined:
High resistance
Streamlined:
Low resistance
Small area:
Low resistance
dart
streamlined car
sail (boat)
parachute
person walking
through water
submarine
fish
boat S