Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 340 · 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.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
2. 2.True or false: skating on ice gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) sand on a slippery path (d) a rough doormat
4. 4.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
5. 5.🛞 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 12 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
6. 6.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) powder on a carrom board (d) a tyre with deep treads
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
8. 8.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) a wheel on ball bearings
10. 10.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.True or false: a rough doormat gives less friction. (a) False (b) True
15. 15.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a smooth steel slide
17. 17.🛞 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. How many newtons more were needed on sandpaper than on ice?
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a tyre with deep treads (d) a rough doormat
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 4 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
21. 21.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
22. 22.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
23. 23.🛞 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, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 12 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.True or false: sand on a slippery path gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
29. 29.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) chalk on a gym bar
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 6 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
32. 32.True or false: powder on a carrom board gives more friction. (a) True (b) False
33. 33.True or false: a box pushed on carpet gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
35. 35.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
39. 39.True or false: powder on a carrom board gives less friction. (a) True (b) False
40. 40.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction

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