Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 438 · 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.True or false: a smooth steel slide gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
3. 3.True or false: skating on ice gives more friction. (a) True (b) False
4. 4.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 15 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
6. 6.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, a carpet 11 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
8. 8.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a grippy rubber sole (d) a rough doormat
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a grippy rubber sole
10. 10.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a box pushed on carpet (d) powder on a carrom board
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
13. 13.🛞 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 wooden plank 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
16. 16.True or false: a tyre with deep treads gives more friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
19. 19.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
20. 20.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) a smooth steel slide
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) powder on a carrom board (d) a wheel on ball bearings
27. 27.True or false: a tyre with deep treads gives less friction. (a) True (b) False
28. 28.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.True or false: chalk on a gym bar gives more friction. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) a wheel on ball bearings
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
35. 35.🛞 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 glass sheet 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
39. 39.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) skating on ice (d) chalk on a gym bar
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 6 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank

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