Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 136 · 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.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
3. 3.True or false: chalk on a gym bar gives less friction. (a) True (b) False
4. 4.True or false: a tyre with deep treads gives more friction. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
6. 6.True or false: powder on a carrom board gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
9. 9.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) skating on ice (d) chalk on a gym bar
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
11. 11.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 11 N, a carpet 14 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
13. 13.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a tyre with deep treads (d) a grippy rubber sole
15. 15.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
16. 16.True or false: chalk on a gym bar gives more friction. (a) False (b) True
17. 17.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
19. 19.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
20. 20.True or false: sand on a slippery path gives more friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
22. 22.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
23. 23.🛞 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 8 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
24. 24.🛞 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 wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
25. 25.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
26. 26.True or false: powder on a carrom board gives more friction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
30. 30.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a grippy rubber sole (d) a tyre with deep treads
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 2 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
32. 32.True or false: a wet tiled floor gives more friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a rough doormat (d) a wheel on ball bearings
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
38. 38.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) powder on a carrom board (d) a wet tiled floor
40. 40.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction

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