Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 738 · 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.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
2. 2.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
3. 3.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
4. 4.True or false: chalk on a gym bar gives more friction. (a) True (b) False
5. 5.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
8. 8.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a grippy rubber sole (d) oil on a squeaky hinge
9. 9.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
11. 11.True or false: a smooth steel slide gives more friction. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a wet tiled floor (d) a rough doormat
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) powder on a carrom board (d) a wet tiled floor
15. 15.True or false: a grippy rubber sole gives less friction. (a) False (b) True
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
19. 19.True or false: sand on a slippery path gives more friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a wheel on ball bearings
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
28. 28.🛞 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 carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) oil on a squeaky hinge (d) a tyre with deep treads
30. 30.🛞 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 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
31. 31.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
33. 33.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
34. 34.True or false: a rough doormat gives less friction. (a) False (b) True
35. 35.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
36. 36.🛞 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 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
39. 39.🛞 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 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
40. 40.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction

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