Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 335 · 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) a grippy rubber sole (b) chalk on a gym bar (c) powder on a carrom board (d) a tyre with deep treads
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) powder on a carrom board (d) a smooth steel slide
4. 4.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
9. 9.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) oil on a squeaky hinge (d) a rough doormat
12. 12.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
13. 13.True or false: a rough doormat gives less friction. (a) True (b) False
14. 14.True or false: skating on ice gives less friction. (a) True (b) False
15. 15.True or false: powder on a carrom board gives less friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 13 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
19. 19.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a grippy rubber sole (d) a tyre with deep treads
22. 22.True or false: chalk on a gym bar gives less friction. (a) False (b) True
23. 23.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
26. 26.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
27. 27.🛞 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, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
28. 28.True or false: sand on a slippery path gives more friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
32. 32.True or false: a smooth steel slide gives more friction. (a) False (b) True
33. 33.True or false: powder on a carrom board gives more friction. (a) False (b) True
34. 34.True or false: skating on ice gives more friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
38. 38.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
39. 39.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
40. 40.True or false: a rough doormat gives more friction. (a) True (b) False

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