Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 115 · 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 rough doormat gives less friction. (a) True (b) False
2. 2.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
3. 3.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) chalk on a gym bar (d) oil on a squeaky hinge
4. 4.True or false: sand on a slippery path gives more friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
6. 6.True or false: skating on ice gives more friction. (a) True (b) False
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a box pushed on carpet (d) a wet tiled floor
9. 9.🛞 Is friction helpful or a problem here: striking a matchstick? (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 7 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
11. 11.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
13. 13.True or false: sand on a slippery path gives less friction. (a) True (b) False
14. 14.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
15. 15.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) powder on a carrom board (d) a smooth steel slide
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) powder on a carrom board (d) a wheel on ball bearings
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a box pushed on carpet (d) a wheel on ball bearings
19. 19.🛞 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 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
20. 20.🛞 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 wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
22. 22.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
24. 24.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 16 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
29. 29.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
30. 30.True or false: a tyre with deep treads gives less friction. (a) True (b) False
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
32. 32.True or false: a tyre with deep treads gives more friction. (a) False (b) True
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
34. 34.🛞 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?
35. 35.True or false: chalk on a gym bar gives more friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a grippy rubber sole (d) sand on a slippery path
38. 38.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
39. 39.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet

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