Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 927 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
3. 3.True or false: sand on a slippery path gives more friction. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
5. 5.🛞 More or less friction: a wet tiled floor? (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 5 N, a carpet 7 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
8. 8.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
10. 10.True or false: a rough doormat gives more friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a tyre with deep treads (d) skating on ice
12. 12.True or false: sand on a slippery path gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
14. 14.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
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 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
17. 17.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
18. 18.True or false: chalk on a gym bar gives more friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wet tiled floor (d) a wheel on ball bearings
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.True or false: a rough doormat gives less friction. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a rough doormat (d) a box pushed on carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a rough doormat (d) a grippy rubber sole
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.True or false: powder on a carrom board gives more friction. (a) True (b) False
31. 31.True or false: skating on ice gives more friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
33. 33.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
34. 34.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
35. 35.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
36. 36.True or false: chalk on a gym bar gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
39. 39.True or false: a box pushed on carpet gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet

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