Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 97 · 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.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
4. 4.True or false: skating on ice gives more friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
8. 8.True or false: sand on a slippery path gives more friction. (a) True (b) False
9. 9.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
12. 12.🛞 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 9 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
15. 15.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
16. 16.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) sand on a slippery path (d) a rough doormat
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) oil on a squeaky hinge (d) a smooth steel slide
19. 19.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a box pushed on carpet (d) a wet tiled floor
26. 26.True or false: a wet tiled floor gives more friction. (a) True (b) False
27. 27.🛞 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, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
28. 28.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a grippy rubber sole (d) a rough doormat
29. 29.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
30. 30.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
32. 32.True or false: a rough doormat gives less friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a tyre with deep treads (d) a smooth steel slide
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.True or false: chalk on a gym bar gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 11 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
37. 37.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
40. 40.True or false: a tyre with deep treads gives more friction. (a) False (b) True

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