Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 571 · 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.True or false: a grippy rubber sole gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.True or false: a box pushed on carpet gives more friction. (a) False (b) True
5. 5.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
7. 7.True or false: a smooth steel slide gives less friction. (a) False (b) True
8. 8.True or false: a tyre with deep treads gives more friction. (a) False (b) True
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
10. 10.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
11. 11.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
12. 12.🛞 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 15 N. How many newtons more were needed on sandpaper than on ice?
13. 13.True or false: a smooth steel slide gives more friction. (a) False (b) True
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) chalk on a gym bar (d) a rough doormat
16. 16.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a grippy rubber sole (d) a box pushed on carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) powder on a carrom board (d) a wet tiled floor
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on a carpet than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
21. 21.🛞 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 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
22. 22.True or false: a rough doormat gives less friction. (a) True (b) False
23. 23.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
24. 24.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
26. 26.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
27. 27.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
31. 31.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
33. 33.True or false: a grippy rubber sole gives less friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) oil on a squeaky hinge (d) chalk on a gym bar
35. 35.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
36. 36.🛞 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 carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
39. 39.True or false: skating on ice gives less friction. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a wet tiled floor (d) a rough doormat

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