Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 53 · 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.True or false: powder on a carrom board gives more friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) chalk on a gym bar (d) a wet tiled floor
3. 3.True or false: chalk on a gym bar gives less friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
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 12 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
9. 9.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
10. 10.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
12. 12.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) skating on ice (d) a box pushed on carpet
18. 18.True or false: a rough doormat gives less friction. (a) False (b) True
19. 19.True or false: a smooth steel slide gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: sand on a slippery path gives more friction. (a) True (b) False
22. 22.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
23. 23.True or false: chalk on a gym bar gives more friction. (a) True (b) False
24. 24.True or false: powder on a carrom board gives less friction. (a) False (b) True
25. 25.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
29. 29.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
34. 34.🛞 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 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
36. 36.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
37. 37.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
39. 39.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper

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