Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 603 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
2. 2.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
3. 3.True or false: a smooth steel slide gives more friction. (a) False (b) True
4. 4.True or false: a wet tiled floor gives more friction. (a) False (b) True
5. 5.True or false: a tyre with deep treads gives more friction. (a) False (b) True
6. 6.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a smooth steel slide (d) a tyre with deep treads
9. 9.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) skating on ice (d) a grippy rubber sole
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 11 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) chalk on a gym bar
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) chalk on a gym bar (d) a tyre with deep treads
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) skating on ice (d) sand on a slippery path
21. 21.True or false: a rough doormat gives less friction. (a) True (b) False
22. 22.True or false: powder on a carrom board gives more friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.True or false: a box pushed on carpet gives less friction. (a) False (b) True
27. 27.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a box pushed on carpet (d) a wet tiled floor
29. 29.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wet tiled floor (d) a grippy rubber sole
32. 32.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a rough doormat (d) oil on a squeaky hinge
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
34. 34.True or false: chalk on a gym bar gives more friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
36. 36.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
40. 40.True or false: skating on ice gives more friction. (a) True (b) False

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