Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 871 · 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) a box pushed on carpet (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wet tiled floor
2. 2.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
3. 3.🛞 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 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 13 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
6. 6.🛞 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 carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
9. 9.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a box pushed on carpet (d) a wet tiled floor
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) oil on a squeaky hinge (d) chalk on a gym bar
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
14. 14.True or false: a tyre with deep treads gives less friction. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a rough doormat (d) oil on a squeaky hinge
16. 16.True or false: sand on a slippery path gives more friction. (a) True (b) False
17. 17.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
19. 19.🛞 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 4 N. How many newtons more were needed on a carpet than on ice?
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) chalk on a gym bar (d) a wet tiled floor
21. 21.True or false: powder on a carrom board gives more friction. (a) True (b) False
22. 22.🛞 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 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a rough doormat (d) a wheel on ball bearings
25. 25.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 13 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
27. 27.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
29. 29.True or false: skating on ice gives less friction. (a) False (b) True
30. 30.🛞 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, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
32. 32.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
33. 33.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
37. 37.True or false: a wet tiled floor gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
39. 39.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
40. 40.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction

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