Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 259 · 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.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) oil on a squeaky hinge (d) a grippy rubber sole
2. 2.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) skating on ice (d) powder on a carrom board
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
8. 8.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
9. 9.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
10. 10.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
12. 12.🛞 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 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
14. 14.True or false: sand on a slippery path gives less friction. (a) True (b) False
15. 15.True or false: powder on a carrom board gives more friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
18. 18.🛞 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 10 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
19. 19.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
20. 20.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
21. 21.🛞 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 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
23. 23.True or false: chalk on a gym bar gives more friction. (a) True (b) False
24. 24.True or false: a tyre with deep treads gives less friction. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
26. 26.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) sand on a slippery path (d) skating on ice
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a box pushed on carpet (d) sand on a slippery path
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
30. 30.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
37. 37.True or false: a rough doormat gives more friction. (a) True (b) False
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
39. 39.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice

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