Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 116 · 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: striking a matchstick? (a) helpful (b) a problem
2. 2.🛞 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 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
4. 4.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
6. 6.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
7. 7.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
8. 8.🛞 More or less friction: a rough doormat? (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 7 N, a carpet 9 N, sandpaper 13 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 12 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
11. 11.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) chalk on a gym bar (d) a grippy rubber sole
12. 12.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
13. 13.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
14. 14.True or false: skating on ice gives more friction. (a) True (b) False
15. 15.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
16. 16.True or false: skating on ice gives less friction. (a) False (b) True
17. 17.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
18. 18.True or false: a rough doormat gives more friction. (a) False (b) True
19. 19.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
20. 20.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
21. 21.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) sand on a slippery path (d) a grippy rubber sole
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
25. 25.True or false: powder on a carrom board gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, a carpet 14 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.🛞 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 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) 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 10 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.True or false: a tyre with deep treads gives more friction. (a) False (b) True
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
39. 39.True or false: a rough doormat gives less friction. (a) True (b) False
40. 40.True or false: a box pushed on carpet gives less friction. (a) True (b) False

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