Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 689 · 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: powder on a carrom board? (a) more friction (b) less friction
2. 2.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
5. 5.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
6. 6.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wet tiled floor (d) sand on a slippery path
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a smooth steel slide (d) a tyre with deep treads
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
10. 10.True or false: powder on a carrom board gives less friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
12. 12.True or false: a box pushed on carpet gives less friction. (a) True (b) False
13. 13.True or false: skating on ice gives less friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
16. 16.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
18. 18.True or false: a rough doormat gives more friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
20. 20.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a box pushed on carpet (d) chalk on a gym bar
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
25. 25.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.🛞 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 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
30. 30.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a wheel on ball bearings (d) chalk on a gym bar
31. 31.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a rough doormat (d) chalk on a gym bar
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
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 8 N, a carpet 10 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
40. 40.🛞 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 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet

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