Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 293 · 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.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
2. 2.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
4. 4.True or false: skating on ice gives more friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
6. 6.True or false: a grippy rubber sole gives more friction. (a) True (b) False
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a grippy rubber sole (d) a wet tiled floor
9. 9.True or false: powder on a carrom board gives less friction. (a) False (b) True
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
13. 13.🛞 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 wooden plank 9 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
14. 14.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
15. 15.True or false: a box pushed on carpet gives more friction. (a) False (b) True
16. 16.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
17. 17.True or false: a rough doormat gives less friction. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a rough doormat (d) a smooth steel slide
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.True or false: a grippy rubber sole gives less friction. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) chalk on a gym bar (d) skating on ice
22. 22.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
25. 25.True or false: sand on a slippery path gives more friction. (a) True (b) False
26. 26.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
28. 28.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
29. 29.🛞 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. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
31. 31.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
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 7 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
35. 35.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
37. 37.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
39. 39.🛞 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, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
40. 40.True or false: powder on a carrom board gives more friction. (a) True (b) False

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