Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 454 · 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 wheel on ball bearings? (a) more friction (b) less friction
2. 2.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
4. 4.🛞 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 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
5. 5.🛞 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 glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
6. 6.True or false: a box pushed on carpet gives less friction. (a) True (b) False
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.True or false: a rough doormat gives less friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
10. 10.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
12. 12.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a rough doormat (d) skating on ice
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a wheel on ball bearings (d) a rough doormat
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
19. 19.🛞 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 carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
20. 20.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
21. 21.True or false: sand on a slippery path gives less friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) sand on a slippery path (d) skating on ice
23. 23.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
26. 26.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) sand on a slippery path (d) a box pushed on carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
29. 29.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
30. 30.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
31. 31.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
35. 35.🛞 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 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
37. 37.True or false: a tyre with deep treads gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?

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