Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 144 · 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: writing with a pencil? (a) helpful (b) a problem
2. 2.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
3. 3.True or false: powder on a carrom board gives more friction. (a) True (b) False
4. 4.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
5. 5.True or false: a tyre with deep treads gives less friction. (a) False (b) True
6. 6.🛞 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, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a wet tiled floor
9. 9.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
10. 10.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) sand on a slippery path (d) oil on a squeaky hinge
15. 15.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.True or false: chalk on a gym bar gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a tyre with deep treads (d) a smooth steel slide
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
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 8 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a wheel on ball bearings (d) a box pushed on carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a tyre with deep treads gives more friction. (a) False (b) True
27. 27.True or false: a smooth steel slide gives less friction. (a) True (b) False
28. 28.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
29. 29.🛞 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. How many newtons more were needed on a carpet than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 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 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
32. 32.True or false: a grippy rubber sole gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
35. 35.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
38. 38.True or false: a smooth steel slide gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?

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