Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 196 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
2. 2.True or false: a wet tiled floor gives more friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 6 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
5. 5.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
6. 6.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
7. 7.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
8. 8.🛞 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 9 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
9. 9.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
16. 16.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
17. 17.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
19. 19.True or false: a smooth steel slide gives more friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a wet tiled floor (d) skating on ice
21. 21.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
22. 22.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
23. 23.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
24. 24.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
26. 26.True or false: a tyre with deep treads gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
29. 29.True or false: a box pushed on carpet gives more friction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
31. 31.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) skating on ice (d) a smooth steel slide
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: powder on a carrom board gives less friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
35. 35.🛞 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, sandpaper 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a tyre with deep treads (d) a wet tiled floor
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) chalk on a gym bar (d) a rough doormat
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem

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