Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 879 · 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.True or false: a grippy rubber sole gives less friction. (a) True (b) False
2. 2.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
3. 3.True or false: a grippy rubber sole gives more friction. (a) False (b) True
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a tyre with deep treads (d) a wheel on ball bearings
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
10. 10.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
11. 11.True or false: skating on ice gives more friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a tyre with deep treads (d) skating on ice
13. 13.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
18. 18.🛞 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 10 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
19. 19.🛞 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 10 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
20. 20.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
21. 21.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
22. 22.True or false: a smooth steel slide gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
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 wooden plank 6 N, a carpet 9 N, sandpaper 11 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
29. 29.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
31. 31.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) skating on ice (d) chalk on a gym bar
32. 32.True or false: powder on a carrom board gives less friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
34. 34.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
35. 35.🛞 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 12 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a wheel on ball bearings (d) a grippy rubber sole
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 12 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
40. 40.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) sand on a slippery path (d) a box pushed on carpet

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