Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 690 · 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) skating on ice (b) a rough doormat (c) a box pushed on carpet (d) chalk on a gym bar
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
3. 3.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
4. 4.True or false: a tyre with deep treads gives more friction. (a) True (b) False
5. 5.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.True or false: a rough doormat gives more friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
9. 9.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
10. 10.True or false: a rough doormat gives less friction. (a) False (b) True
11. 11.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
12. 12.🛞 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 11 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
15. 15.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
16. 16.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
17. 17.True or false: skating on ice gives more friction. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
20. 20.True or false: a box pushed on carpet 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.🛞 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 13 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
23. 23.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
25. 25.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
27. 27.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
28. 28.True or false: a grippy rubber sole gives less friction. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a wet tiled floor (d) powder on a carrom board
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
31. 31.🛞 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 carpet 11 N, sandpaper 15 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
32. 32.True or false: sand on a slippery path gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 13 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
35. 35.🛞 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, sandpaper 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.🛞 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 10 N, a carpet 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
38. 38.True or false: a smooth steel slide gives more friction. (a) True (b) False
39. 39.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
40. 40.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber

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