Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 56 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a wheel on ball bearings (d) a tyre with deep treads
3. 3.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
5. 5.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
6. 6.True or false: a smooth steel slide gives more friction. (a) True (b) False
7. 7.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
8. 8.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) powder on a carrom board (d) a grippy rubber sole
10. 10.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
11. 11.True or false: chalk on a gym bar gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a glass sheet 4 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) False (b) True
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
20. 20.True or false: a tyre with deep treads gives more friction. (a) True (b) False
21. 21.🛞 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 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) oil on a squeaky hinge (d) a rough doormat
24. 24.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
26. 26.🛞 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, a carpet 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
28. 28.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a rough doormat (d) skating on ice
29. 29.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
30. 30.True or false: powder on a carrom board gives less friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
33. 33.True or false: a wet tiled floor gives more friction. (a) True (b) False
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) a wet tiled floor
36. 36.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
37. 37.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
38. 38.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 1 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
40. 40.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction

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