Unit 4 E Friction Unit 4 E Friction

Unit 4 E: Friction

Unit 4 E: Friction

Unit 4 E: 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 Unit 4 E: Vocabulary-

Unit 4 E: Forcemeters 3 Newtons 7 Newtons 5 Newtons Unit 4 E: Forcemeters : L. O. 1, 2 : NC. 4. 2 e 8. 5 Newtons

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

Unit 4 E: Forces against movement This picture shows the same box being pushed on different surfaces. Unit 4 E: Forces against movement: L. O. 3 : NC. 4. 2 d

Unit 4 E: Forces against movement: L. O. 3 : NC. 4. 2 d

Unit 4 E: 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 Unit 4 E: Investigation : L. O. 4, 5, 6, 7, 8 : NC. 1. 1 b; 1. 2 d, e, f, g, h, j

Unit 4 E: 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 4 E: Investigation : L. O. 4, 5, 6, 7, 8 : NC. 1. 1 b; 1. 2 d, e, f, g, h, j

Unit 4 E: What is this force? Unit 4 E: Forces against movement: L. O. 3 : NC. 4. 2 d

Unit 4 E: High and Low Friction Is it best for each of the following to have high or low friction? Situation High Friction Tyres on a car Playground slide Goalkeeper’s gloves Shoe laces A drawer Ice skates Climbing rope Unit 4 E: High and Low Friction: L. O. 3 : NC. 4. 2 d Low friction

Unit 4 E: 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 4 E: Water Resistance: L. O. 11, 12 : NC. 4. 2 c, d

Unit 4 E: Water Resistance water Unit 4 E: Water Resistance: L. O. 13 : NC. 4. 2 c, d movement

Unit 4 E: Air Resistance movement air resistance Unit 4 E: Air Resistance: L. O. 13 : NC. 4. 2 c, d

Unit 4 E: Summary brakes ice skates Rough: high friction tyres goalkeeper’s gloves : Big h ce g n i a H ist res slide Force between moving solid surfaces Air resistanceforce on an object moving through air a are Smooth: low friction Friction: a force Sma ll ar ea Low resis : tanc e parachute streamlined car sail (boat) dart drawers Water resistanceforce on an object moving through water ed: n i l ream ance t s Non resist High St Lo ream w re line sis d: ta nc e submarine person walking through water fish boat