Engineering Worksheet: Friction

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

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