Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 859 · 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.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
2. 2.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a wet tiled floor (d) oil on a squeaky hinge
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) skating on ice (d) powder on a carrom board
5. 5.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a box pushed on carpet (d) sand on a slippery path
6. 6.True or false: skating on ice gives more friction. (a) False (b) True
7. 7.True or false: a rough doormat gives less friction. (a) True (b) False
8. 8.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 12 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
10. 10.True or false: skating on ice gives less friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) sand on a slippery path (d) a wheel on ball bearings
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
15. 15.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) sand on a slippery path (d) a tyre with deep treads
17. 17.True or false: powder on a carrom board gives less friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, sandpaper 14 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
23. 23.True or false: chalk on a gym bar gives less friction. (a) False (b) True
24. 24.True or false: a smooth steel slide gives more friction. (a) False (b) True
25. 25.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
26. 26.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) skating on ice (d) oil on a squeaky hinge
28. 28.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
29. 29.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
31. 31.🛞 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 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
35. 35.🛞 More or less friction: a wheel on ball bearings? (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 5 N, a carpet 6 N, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.True or false: sand on a slippery path gives less friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a box pushed on carpet (d) a wheel on ball bearings
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper

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