Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 310 · 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: tyres wearing down? (a) helpful (b) a problem
2. 2.True or false: sand on a slippery path gives more friction. (a) True (b) False
3. 3.🛞 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 10 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.True or false: a grippy rubber sole gives less friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
6. 6.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a tyre with deep treads (d) a wet tiled floor
8. 8.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
9. 9.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
12. 12.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) skating on ice
16. 16.🛞 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 9 N, sandpaper 13 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
17. 17.True or false: skating on ice gives more friction. (a) True (b) False
18. 18.True or false: a grippy rubber sole gives more friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
21. 21.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
23. 23.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a rough doormat (d) a grippy rubber sole
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a box pushed on carpet (d) a tyre with deep treads
32. 32.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a rough doormat (d) skating on ice
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
34. 34.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) skating on ice (d) sand on a slippery path
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
36. 36.True or false: a tyre with deep treads 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 carpet 9 N, sandpaper 11 N, ice 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
38. 38.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
39. 39.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
40. 40.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts

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