Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 326 · 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: a smooth steel slide gives less friction. (a) False (b) True
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
3. 3.🛞 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 12 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 11 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
5. 5.True or false: a wet tiled floor gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
7. 7.True or false: powder on a carrom board gives more friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
9. 9.True or false: a box pushed on carpet gives less friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a box pushed on carpet (d) skating on ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a rough doormat
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) powder on a carrom board (d) chalk on a gym bar
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wheel on ball bearings (d) chalk on a gym bar
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
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 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
22. 22.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
23. 23.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a rough doormat (d) a box pushed on carpet
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
25. 25.True or false: skating on ice gives less friction. (a) False (b) True
26. 26.True or false: chalk on a gym bar gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
30. 30.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) oil on a squeaky hinge (d) a smooth steel slide
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
35. 35.True or false: a box pushed on carpet gives more friction. (a) True (b) False
36. 36.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
37. 37.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
38. 38.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 1 N, a wooden plank 3 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 7 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper

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