Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 200 · 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) magnetic (c) warm (d) wet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a rough doormat (d) a wheel on ball bearings
4. 4.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) powder on a carrom board (d) skating on ice
5. 5.True or false: a tyre with deep treads gives more friction. (a) True (b) False
6. 6.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
7. 7.True or false: a tyre with deep treads gives less friction. (a) True (b) False
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
9. 9.True or false: a rough doormat gives less friction. (a) True (b) False
10. 10.🛞 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, a carpet 8 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
15. 15.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a rough doormat (d) a wet tiled floor
17. 17.True or false: powder on a carrom board gives more friction. (a) False (b) True
18. 18.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
19. 19.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
20. 20.True or false: a smooth steel slide gives less friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.🛞 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, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
25. 25.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
26. 26.True or false: a smooth steel slide gives more friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
30. 30.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
32. 32.True or false: a grippy rubber sole gives more friction. (a) False (b) True
33. 33.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
36. 36.True or false: chalk on a gym bar gives more friction. (a) False (b) True
37. 37.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
38. 38.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) chalk on a gym bar (d) sand on a slippery path
39. 39.🛞 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 11 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
40. 40.True or false: sand on a slippery path gives more friction. (a) False (b) True

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