Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 314 · 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.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) skating on ice (d) a wheel on ball bearings
4. 4.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
5. 5.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
6. 6.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
8. 8.True or false: a wet tiled floor gives less friction. (a) False (b) True
9. 9.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
10. 10.True or false: a wet tiled floor gives more friction. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
12. 12.🛞 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 carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
14. 14.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a wet tiled floor (d) a tyre with deep treads
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
19. 19.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
20. 20.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
22. 22.True or false: sand on a slippery path gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 8 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a tyre with deep treads (d) sand on a slippery path
26. 26.True or false: skating on ice gives more friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: a tyre with deep treads gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: a smooth steel slide gives more friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
33. 33.True or false: a grippy rubber sole gives less friction. (a) True (b) False
34. 34.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 14 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 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 4 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
38. 38.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, sandpaper 14 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet

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