Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 519 · 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.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
4. 4.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
5. 5.True or false: a smooth steel slide gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a box pushed on carpet (d) a grippy rubber sole
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
10. 10.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
12. 12.🛞 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 carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
13. 13.🛞 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, sandpaper 8 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
16. 16.True or false: a wet tiled floor gives less friction. (a) False (b) True
17. 17.🛞 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 2 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
18. 18.True or false: a tyre with deep treads gives less friction. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) skating on ice (d) a smooth steel slide
20. 20.True or false: sand on a slippery path gives more friction. (a) True (b) False
21. 21.True or false: powder on a carrom board gives more friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a grippy rubber sole (d) chalk on a gym bar
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
25. 25.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
26. 26.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a wheel on ball bearings (d) a tyre with deep treads
27. 27.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
29. 29.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) skating on ice
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) sand on a slippery path (d) a rough doormat
32. 32.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
33. 33.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
37. 37.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
38. 38.True or false: a rough doormat 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: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
40. 40.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold

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