Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 484 · 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.True or false: a wet tiled floor gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) skating on ice (d) a wet tiled floor
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.True or false: skating on ice gives more friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a grippy rubber sole (d) chalk on a gym bar
8. 8.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
9. 9.True or false: a rough doormat gives less friction. (a) False (b) True
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
11. 11.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 11 N, sandpaper 15 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
17. 17.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
19. 19.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
20. 20.True or false: a grippy rubber sole gives less friction. (a) False (b) True
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wheel on ball bearings (d) a tyre with deep treads
23. 23.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
24. 24.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
25. 25.🛞 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 glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
27. 27.True or false: a box pushed on carpet gives more friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 11 N, a carpet 14 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
32. 32.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a smooth steel slide (d) chalk on a gym bar
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) skating on ice (d) a grippy rubber sole
35. 35.True or false: a grippy rubber sole gives more friction. (a) True (b) False
36. 36.True or false: powder on a carrom board gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
38. 38.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
39. 39.True or false: sand on a slippery path gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank

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