Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 333 · 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) with the motion (b) only upwards (c) against the motion (d) only on ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
3. 3.True or false: a box pushed on carpet gives less friction. (a) False (b) True
4. 4.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
8. 8.🛞 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 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a box pushed on carpet (d) powder on a carrom board
11. 11.True or false: chalk on a gym bar gives less friction. (a) True (b) False
12. 12.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
15. 15.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
17. 17.🛞 More or less friction: a rough doormat? (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 2 N, a wooden plank 3 N, a carpet 6 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
19. 19.True or false: sand on a slippery path gives less friction. (a) True (b) False
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
26. 26.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a box pushed on carpet (d) a rough doormat
27. 27.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.True or false: sand on a slippery path gives more friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
32. 32.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
33. 33.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
34. 34.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
35. 35.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
36. 36.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
37. 37.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a rough doormat (d) sand on a slippery path
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) chalk on a gym bar (d) a box pushed on carpet
39. 39.🛞 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 6 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
40. 40.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction

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