Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 715 · 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) True (b) False
2. 2.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
3. 3.🛞 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 11 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
4. 4.True or false: sand on a slippery path gives less friction. (a) True (b) False
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
6. 6.True or false: skating on ice gives less friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) sand on a slippery path (d) a wet tiled floor
8. 8.🛞 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 most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
9. 9.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a grippy rubber sole (d) a rough doormat
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wheel on ball bearings (d) a tyre with deep treads
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
13. 13.True or false: a box pushed on carpet gives less friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
17. 17.🛞 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 wooden plank 9 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
19. 19.True or false: a tyre with deep treads gives more friction. (a) False (b) True
20. 20.True or false: a rough doormat gives less friction. (a) True (b) False
21. 21.True or false: chalk on a gym bar gives more friction. (a) True (b) False
22. 22.True or false: a tyre with deep treads gives less friction. (a) True (b) False
23. 23.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
26. 26.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wet tiled floor (d) chalk on a gym bar
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 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, sandpaper 4 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
29. 29.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
30. 30.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
31. 31.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
32. 32.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
34. 34.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
35. 35.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a box pushed on carpet (d) skating on ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
39. 39.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
40. 40.True or false: a wheel on ball bearings gives less friction. (a) True (b) False

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