Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 105 · 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: gripping a cricket bat? (a) helpful (b) a problem
2. 2.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
3. 3.True or false: a tyre with deep treads gives less friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a wheel on ball bearings (d) a rough doormat
5. 5.True or false: a box pushed on carpet gives less friction. (a) True (b) False
6. 6.True or false: skating on ice gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) sand on a slippery path (d) a rough doormat
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) powder on a carrom board
10. 10.🛞 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, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
13. 13.🛞 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 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.True or false: a rough doormat gives more friction. (a) False (b) True
16. 16.🛞 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 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
18. 18.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
21. 21.True or false: a smooth steel slide gives less friction. (a) True (b) False
22. 22.🛞 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 12 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
25. 25.True or false: chalk on a gym bar gives less friction. (a) True (b) False
26. 26.🛞 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 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
28. 28.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
29. 29.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
31. 31.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
32. 32.True or false: a rough doormat gives less friction. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a wheel on ball bearings (d) oil on a squeaky hinge
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
35. 35.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
36. 36.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wet tiled floor (d) powder on a carrom board
38. 38.🛞 More or less friction: a wheel on ball bearings? (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 carpet 6 N, sandpaper 10 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
40. 40.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction

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