Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 93 · 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: powder on a carrom board gives less friction. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a wet tiled floor (d) a smooth steel slide
3. 3.🛞 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 5 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
4. 4.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
6. 6.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a grippy rubber sole (d) oil on a squeaky hinge
7. 7.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
8. 8.True or false: a smooth steel slide gives more friction. (a) True (b) False
9. 9.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) skating on ice (d) a tyre with deep treads
11. 11.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) powder on a carrom board
12. 12.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
13. 13.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
15. 15.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a wet tiled floor (d) a tyre with deep treads
17. 17.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
18. 18.True or false: sand on a slippery path gives more friction. (a) True (b) False
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 carpet 6 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
22. 22.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 13 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
30. 30.🛞 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 7 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) oil on a squeaky hinge (d) a grippy rubber sole
32. 32.🛞 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 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
36. 36.🛞 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 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
37. 37.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
38. 38.True or false: a wet tiled floor gives more friction. (a) False (b) True
39. 39.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
40. 40.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction

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