Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 647 · 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.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
2. 2.True or false: skating on ice gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a grippy rubber sole (d) oil on a squeaky hinge
4. 4.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) skating on ice (d) oil on a squeaky hinge
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) sand on a slippery path (d) a wet tiled floor
6. 6.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a box pushed on carpet (d) oil on a squeaky hinge
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
8. 8.True or false: a rough doormat gives less friction. (a) True (b) False
9. 9.🛞 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 8 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.True or false: a smooth steel slide gives more friction. (a) True (b) False
11. 11.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) chalk on a gym bar (d) a rough doormat
13. 13.True or false: chalk on a gym bar gives less friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a wheel on ball bearings (d) skating on ice
15. 15.🛞 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 10 N, sandpaper 12 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: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
17. 17.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
22. 22.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a smooth steel slide (d) a tyre with deep treads
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
30. 30.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.True or false: sand on a slippery path gives less friction. (a) True (b) False
34. 34.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
36. 36.True or false: a wet tiled floor gives less friction. (a) False (b) True
37. 37.🛞 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 12 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
38. 38.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
39. 39.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 7 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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