Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 542 · 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.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
2. 2.True or false: chalk on a gym bar gives less friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 11 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
7. 7.True or false: sand on a slippery path gives less friction. (a) False (b) True
8. 8.🛞 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 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
9. 9.True or false: a rough doormat gives less friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 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, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
12. 12.True or false: a smooth steel slide gives less friction. (a) True (b) False
13. 13.True or false: sand on a slippery path gives more friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
15. 15.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
17. 17.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) powder on a carrom board (d) a grippy rubber sole
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a wheel on ball bearings (d) sand on a slippery path
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
21. 21.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) powder on a carrom board (d) skating on ice
23. 23.🛞 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. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 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 11 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
25. 25.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a tyre with deep treads
28. 28.🛞 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 4 N. How many newtons more were needed on a carpet than on ice?
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a smooth steel slide (d) oil on a squeaky hinge
30. 30.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
34. 34.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
35. 35.True or false: a box pushed on carpet gives more friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a grippy rubber sole (d) oil on a squeaky hinge
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) skating on ice (d) a smooth steel slide
38. 38.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
39. 39.True or false: a smooth steel slide gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet

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