Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 104 · 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 1 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 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 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
3. 3.🛞 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 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
4. 4.True or false: a rough doormat gives more friction. (a) False (b) True
5. 5.🛞 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, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
7. 7.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a tyre with deep treads (d) a wheel on ball bearings
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a grippy rubber sole (d) a smooth steel slide
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a box pushed on carpet (d) chalk on a gym bar
10. 10.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a grippy rubber sole (d) chalk on a gym bar
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
14. 14.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
15. 15.True or false: a smooth steel slide gives more friction. (a) True (b) False
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
18. 18.True or false: a grippy rubber sole gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
20. 20.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) a smooth steel slide (d) a wet tiled floor
21. 21.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
25. 25.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
26. 26.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 12 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
31. 31.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
32. 32.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
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 2 N, a carpet 3 N, sandpaper 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
35. 35.True or false: a smooth steel slide gives less friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
38. 38.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) chalk on a gym bar (d) a tyre with deep treads
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank

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