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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