Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 490 · 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.🛞 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 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
4. 4.🛞 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, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
5. 5.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
6. 6.🛞 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 carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
7. 7.True or false: a tyre with deep treads gives less friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
9. 9.True or false: chalk on a gym bar gives less friction. (a) False (b) True
10. 10.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a rough doormat (d) oil on a squeaky hinge
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
14. 14.True or false: a rough doormat gives less friction. (a) False (b) True
15. 15.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) sand on a slippery path (d) a tyre with deep treads
17. 17.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
18. 18.True or false: a rough doormat gives more friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
20. 20.True or false: powder on a carrom board gives less friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
22. 22.True or false: a grippy rubber sole gives more friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
24. 24.True or false: a tyre with deep treads gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) powder on a carrom board (d) a rough doormat
33. 33.🛞 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 glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.True or false: sand on a slippery path gives less friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
37. 37.True or false: chalk on a gym bar gives more friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
39. 39.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a box pushed on carpet (d) a tyre with deep treads
40. 40.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True

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