Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 431 · 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.🛞 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 11 N, a carpet 14 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
2. 2.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a box pushed on carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
13. 13.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
14. 14.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
16. 16.🛞 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 6 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 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 glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) sand on a slippery path (d) a wheel on ball bearings
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
23. 23.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a tyre with deep treads (d) a grippy rubber sole
25. 25.True or false: powder on a carrom board gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
27. 27.True or false: sand on a slippery path gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
29. 29.True or false: a rough doormat gives more friction. (a) True (b) False
30. 30.True or false: sand on a slippery path gives less friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (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 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
37. 37.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
38. 38.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) powder on a carrom board (d) a rough doormat
39. 39.True or false: powder on a carrom board gives more friction. (a) False (b) True
40. 40.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction

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