Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 612 · 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.True or false: sand on a slippery path gives less friction. (a) True (b) False
2. 2.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 15 N, ice 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
4. 4.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
5. 5.🛞 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 11 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a smooth steel slide (d) a grippy rubber sole
9. 9.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
10. 10.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
11. 11.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
13. 13.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
15. 15.🛞 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 wooden plank 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
17. 17.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) sand on a slippery path
19. 19.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
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 3 N, a carpet 5 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
22. 22.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
26. 26.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a rough doormat (d) powder on a carrom board
27. 27.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.True or false: a rough doormat gives more friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: a wet tiled floor gives more friction. (a) False (b) True
32. 32.True or false: skating on ice gives more friction. (a) False (b) True
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 3 N, a carpet 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a tyre with deep treads (d) sand on a slippery path
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
38. 38.🛞 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 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) skating on ice (d) a grippy rubber sole
40. 40.🛞 More or less friction: skating on ice? (a) less friction (b) more friction

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