Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 642 · 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: oil on a squeaky hinge? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
3. 3.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
4. 4.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
5. 5.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a wet tiled floor (d) a tyre with deep treads
8. 8.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a grippy rubber sole (d) chalk on a gym bar
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
11. 11.🔍 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
12. 12.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🛞 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) sandpaper (d) a glass sheet
19. 19.🛞 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 8 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
20. 20.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a box pushed on carpet (d) a smooth steel slide
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, a carpet 11 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) skating on ice (d) a wet tiled floor
26. 26.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
27. 27.True or false: skating on ice gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
31. 31.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a tyre with deep treads (d) oil on a squeaky hinge
32. 32.🛞 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, sandpaper 12 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
33. 33.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a rough doormat (d) chalk on a gym bar
34. 34.True or false: a grippy rubber sole gives less friction. (a) False (b) True
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
36. 36.🛞 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, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
37. 37.True or false: chalk on a gym bar gives more friction. (a) False (b) True
38. 38.True or false: a tyre with deep treads gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
40. 40.🛞 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 14 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet

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