Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 339 · 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.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
4. 4.True or false: sand on a slippery path gives more friction. (a) True (b) False
5. 5.True or false: a grippy rubber sole gives less friction. (a) False (b) True
6. 6.True or false: chalk on a gym bar gives more friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a tyre with deep treads (d) oil on a squeaky hinge
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) oil on a squeaky hinge (d) powder on a carrom board
17. 17.🛞 More or less friction: a rough doormat? (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 5 N, a wooden plank 8 N, a carpet 11 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
19. 19.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
20. 20.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
22. 22.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
24. 24.True or false: powder on a carrom board gives more friction. (a) False (b) True
25. 25.🛞 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 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
26. 26.True or false: sand on a slippery path gives less friction. (a) False (b) True
27. 27.🔍 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
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a box pushed on carpet (d) a wet tiled floor
30. 30.True or false: a wet tiled floor gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
33. 33.True or false: a rough doormat gives more friction. (a) True (b) False
34. 34.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
35. 35.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a smooth steel slide (d) a rough doormat
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a wheel on ball bearings (d) a grippy rubber sole
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
40. 40.True or false: a wet tiled floor gives less friction. (a) False (b) True

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