Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 481 · 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.🛞 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 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
3. 3.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wheel on ball bearings (d) a rough doormat
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
6. 6.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
7. 7.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
8. 8.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
9. 9.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a grippy rubber sole (d) a box pushed on carpet
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
14. 14.True or false: sand on a slippery path gives less friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) powder on a carrom board (d) oil on a squeaky hinge
17. 17.True or false: a rough doormat gives more friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
19. 19.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
20. 20.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a wheel on ball bearings (d) a smooth steel slide
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a box pushed on carpet
26. 26.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
28. 28.True or false: a grippy rubber sole gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a grippy rubber sole (d) powder on a carrom board
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 More or less friction: a tyre with deep treads? (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 carpet 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
37. 37.True or false: a rough doormat gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 10 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper

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