Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 173 · 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.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
4. 4.True or false: a box pushed on carpet gives less friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
7. 7.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
8. 8.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
10. 10.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
13. 13.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) powder on a carrom board (d) skating on ice
14. 14.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
17. 17.🛞 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 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
21. 21.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
22. 22.True or false: chalk on a gym bar gives less friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
25. 25.🛞 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 12 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
27. 27.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
29. 29.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
30. 30.True or false: a tyre with deep treads gives less friction. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) sand on a slippery path (d) skating on ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
36. 36.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a grippy rubber sole
38. 38.True or false: powder on a carrom board gives less friction. (a) True (b) False
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
40. 40.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a rough doormat (d) a wheel on ball bearings

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