Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 812 · 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.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) chalk on a gym bar (d) a wheel on ball bearings
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
7. 7.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
10. 10.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a smooth steel slide (d) a box pushed on carpet
12. 12.🛞 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, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
17. 17.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
18. 18.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
20. 20.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 9 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
22. 22.True or false: a rough doormat gives more friction. (a) False (b) True
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.🛞 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, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
25. 25.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a grippy rubber sole (d) a tyre with deep treads
26. 26.🛞 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 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
27. 27.True or false: a box pushed on carpet gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
29. 29.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a rough doormat (d) a wet tiled floor
30. 30.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
31. 31.True or false: chalk on a gym bar gives less friction. (a) False (b) True
32. 32.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) sand on a slippery path (d) a smooth steel slide
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
36. 36.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
37. 37.True or false: a wet tiled floor gives more friction. (a) True (b) False
38. 38.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
40. 40.True or false: powder on a carrom board gives more friction. (a) False (b) True

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