Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 561 · 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: tyres wearing down? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
5. 5.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
6. 6.True or false: a grippy rubber sole gives less friction. (a) True (b) False
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
10. 10.🛞 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, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
12. 12.🛞 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 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) powder on a carrom board (d) a grippy rubber sole
15. 15.True or false: a tyre with deep treads gives more friction. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a grippy rubber sole (d) a wet tiled floor
17. 17.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
18. 18.True or false: sand on a slippery path gives more friction. (a) False (b) True
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a smooth steel slide (d) skating on ice
23. 23.🛞 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) sandpaper (b) a carpet (c) a wooden plank (d) ice
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a wheel on ball bearings (d) a tyre with deep treads
26. 26.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
27. 27.True or false: powder on a carrom board gives less friction. (a) True (b) False
28. 28.🔍 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) a wet tiled floor
29. 29.True or false: chalk on a gym bar gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
34. 34.True or false: a smooth steel slide gives more friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) chalk on a gym bar (d) skating on ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
40. 40.True or false: a smooth steel slide gives less friction. (a) True (b) False

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