Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 61 · 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.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
2. 2.True or false: chalk on a gym bar gives more friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
4. 4.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
6. 6.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a tyre with deep treads (d) a smooth steel slide
8. 8.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
9. 9.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
10. 10.True or false: a grippy rubber sole gives more friction. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wet tiled floor (d) a box pushed on carpet
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, sandpaper 15 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
16. 16.True or false: a wet tiled floor gives more friction. (a) True (b) False
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) skating on ice (d) a grippy rubber sole
23. 23.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
24. 24.True or false: powder on a carrom board gives more friction. (a) True (b) False
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
27. 27.True or false: a smooth steel slide gives more friction. (a) True (b) False
28. 28.True or false: a tyre with deep treads gives less friction. (a) False (b) True
29. 29.True or false: sand on a slippery path gives less friction. (a) True (b) False
30. 30.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
31. 31.🛞 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 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
34. 34.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
36. 36.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 4 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
38. 38.True or false: skating on ice gives less friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
40. 40.True or false: skating on ice gives more friction. (a) False (b) True

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