Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 641 · 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: a carpet 7 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.True or false: skating on ice gives more friction. (a) True (b) False
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) chalk on a gym bar (d) skating on ice
6. 6.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
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 7 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
8. 8.True or false: sand on a slippery path gives more friction. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) powder on a carrom board (d) a wheel on ball bearings
10. 10.🛞 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 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
12. 12.True or false: sand on a slippery path gives less friction. (a) True (b) False
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: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
16. 16.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
19. 19.🛞 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 7 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
21. 21.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
23. 23.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
24. 24.🛞 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 12 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
25. 25.True or false: a tyre with deep treads gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
28. 28.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
31. 31.True or false: a rough doormat 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 16 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
34. 34.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
35. 35.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
36. 36.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
37. 37.True or false: powder on a carrom board gives less friction. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) powder on a carrom board (d) a wheel on ball bearings
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
40. 40.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet

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