Engineering Worksheet: Friction

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

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