Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 862 · 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) only upwards (b) only on ice (c) against the motion (d) with the motion
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) powder on a carrom board (d) a smooth steel slide
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
4. 4.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
5. 5.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) chalk on a gym bar (d) skating on ice
7. 7.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a smooth steel slide
8. 8.🛞 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 7 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
9. 9.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
11. 11.True or false: powder on a carrom board gives more friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) sand on a slippery path (d) a wheel on ball bearings
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
14. 14.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.True or false: a rough doormat gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
19. 19.True or false: a wet tiled floor gives less friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a tyre with deep treads (d) sand on a slippery path
21. 21.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
25. 25.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
26. 26.True or false: a grippy rubber sole gives less friction. (a) False (b) True
27. 27.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: sand on a slippery path gives more friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a rough doormat (d) a box pushed on carpet
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.🛞 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 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
37. 37.True or false: a tyre with deep treads gives less friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) chalk on a gym bar (d) sand on a slippery path
39. 39.True or false: a grippy rubber sole gives more friction. (a) False (b) True
40. 40.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction

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