Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 250 · 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.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
2. 2.True or false: a rough doormat gives less friction. (a) True (b) False
3. 3.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
5. 5.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a tyre with deep treads (d) sand on a slippery path
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
7. 7.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
9. 9.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
11. 11.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
12. 12.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
14. 14.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
15. 15.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
16. 16.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
17. 17.🛞 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 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.True or false: a tyre with deep treads gives more friction. (a) True (b) False
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.True or false: a grippy rubber sole gives more friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
24. 24.🛞 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 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
26. 26.True or false: chalk on a gym bar gives less friction. (a) False (b) True
27. 27.True or false: skating on ice gives less friction. (a) True (b) False
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
29. 29.True or false: a wet tiled floor gives more friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
32. 32.True or false: a grippy rubber sole gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
37. 37.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
38. 38.🛞 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 5 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?

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