Engineering Worksheet: Friction

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

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