Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 520 · 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 rough doormat? (a) less friction (b) more friction
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) powder on a carrom board (d) a grippy rubber sole
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
5. 5.True or false: skating on ice gives more friction. (a) False (b) True
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
7. 7.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
8. 8.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a rough doormat (d) a tyre with deep treads
10. 10.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
11. 11.True or false: chalk on a gym bar gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
13. 13.🛞 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 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
16. 16.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
17. 17.True or false: skating on ice gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
20. 20.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
24. 24.True or false: sand on a slippery path gives less friction. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
26. 26.🛞 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 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) oil on a squeaky hinge (d) sand on a slippery path
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
32. 32.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wheel on ball bearings
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 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
35. 35.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
36. 36.True or false: a wet tiled floor gives more friction. (a) True (b) False
37. 37.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
38. 38.🛞 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 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
39. 39.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic

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