Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 336 · 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.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
2. 2.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
3. 3.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
4. 4.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
7. 7.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.True or false: chalk on a gym bar gives less friction. (a) False (b) True
12. 12.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.🛞 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, sandpaper 14 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
18. 18.True or false: sand on a slippery path gives more friction. (a) True (b) False
19. 19.True or false: a grippy rubber sole gives more friction. (a) False (b) True
20. 20.True or false: skating on ice gives less friction. (a) True (b) False
21. 21.🛞 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 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a wet tiled floor (d) a tyre with deep treads
23. 23.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
27. 27.True or false: a smooth steel slide gives less friction. (a) True (b) False
28. 28.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
29. 29.🛞 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, sandpaper 8 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the most 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 carpet 10 N, sandpaper 11 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) sand on a slippery path (d) skating on ice
36. 36.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
37. 37.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
38. 38.True or false: a tyre with deep treads gives less friction. (a) True (b) False
39. 39.True or false: a rough doormat gives more friction. (a) False (b) True
40. 40.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction

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