Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 938 · 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.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
2. 2.True or false: sand on a slippery path gives less friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) sand on a slippery path (d) a rough doormat
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
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 wooden plank 9 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
8. 8.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
10. 10.True or false: skating on ice gives more friction. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a rough doormat (d) a tyre with deep treads
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) chalk on a gym bar (d) sand on a slippery path
13. 13.True or false: a tyre with deep treads gives more friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) chalk on a gym bar (d) sand on a slippery path
15. 15.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
16. 16.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
17. 17.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
18. 18.🛞 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, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
20. 20.True or false: a rough doormat gives less friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) chalk on a gym bar (d) skating on ice
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
23. 23.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
27. 27.True or false: a wet tiled floor gives less friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
29. 29.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
31. 31.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
34. 34.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
35. 35.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (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 8 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) 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 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice

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