Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 549 · 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.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) powder on a carrom board (d) a wet tiled floor
2. 2.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) chalk on a gym bar (d) a wet tiled floor
3. 3.True or false: powder on a carrom board gives more friction. (a) False (b) True
4. 4.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
6. 6.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
7. 7.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
8. 8.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
10. 10.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
12. 12.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a box pushed on carpet (d) a smooth steel slide
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.True or false: chalk on a gym bar gives less friction. (a) True (b) False
17. 17.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
20. 20.True or false: chalk on a gym bar gives more friction. (a) True (b) False
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
22. 22.🛞 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 wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
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 carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a wooden plank 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on ice?
25. 25.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
28. 28.🛞 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 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
29. 29.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a smooth steel slide (d) a tyre with deep treads
31. 31.True or false: a rough doormat gives less friction. (a) False (b) True
32. 32.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
33. 33.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) sand on a slippery path (d) skating on ice
36. 36.True or false: skating on ice gives more friction. (a) False (b) True
37. 37.🛞 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, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
39. 39.True or false: a box pushed on carpet gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank

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