Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 159 · 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.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a grippy rubber sole (d) skating on ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
4. 4.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
6. 6.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
7. 7.🛞 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) a glass sheet (c) sandpaper (d) a wooden plank
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 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 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
12. 12.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a tyre with deep treads (d) a rough doormat
13. 13.True or false: a rough doormat gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
16. 16.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
17. 17.True or false: a box pushed on carpet gives more friction. (a) False (b) True
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
20. 20.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
21. 21.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
22. 22.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
24. 24.True or false: chalk on a gym bar gives less friction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
28. 28.True or false: a grippy rubber sole gives more friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
30. 30.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a wheel on ball bearings (d) powder on a carrom board
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 11 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
32. 32.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a wet tiled floor (d) sand on a slippery path
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
35. 35.True or false: a tyre with deep treads gives more friction. (a) False (b) True
36. 36.🛞 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 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 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 3 N, sandpaper 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
39. 39.🛞 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 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
40. 40.True or false: a smooth steel slide gives more friction. (a) False (b) True

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