Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 306 · 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: dragging a heavy box? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 14 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a rough doormat (d) a tyre with deep treads
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
7. 7.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a tyre with deep treads (d) chalk on a gym bar
9. 9.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 6 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
14. 14.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
17. 17.True or false: a wet tiled floor gives more friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
19. 19.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
20. 20.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
21. 21.True or false: powder on a carrom board gives less friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
23. 23.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
24. 24.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
27. 27.True or false: chalk on a gym bar gives less friction. (a) True (b) False
28. 28.True or false: a rough doormat gives more friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.🛞 More or less friction: a box pushed on carpet? (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 9 N, a carpet 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
32. 32.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) powder on a carrom board (d) a rough doormat
35. 35.True or false: a grippy rubber sole gives more friction. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a smooth steel slide (d) powder on a carrom board
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
39. 39.True or false: a tyre with deep treads gives less friction. (a) True (b) False
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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