Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 165 · 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.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
2. 2.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) skating on ice (d) a tyre with deep treads
4. 4.🛞 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 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
5. 5.🛞 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 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
6. 6.True or false: sand on a slippery path 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: sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 11 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
9. 9.True or false: a rough doormat gives more friction. (a) True (b) False
10. 10.True or false: a smooth steel slide gives more friction. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a rough doormat
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. How many newtons more were needed on sandpaper than on ice?
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a wet tiled floor (d) sand on a slippery path
14. 14.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
17. 17.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a box pushed on carpet (d) powder on a carrom board
19. 19.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
20. 20.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
23. 23.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) oil on a squeaky hinge (d) a rough doormat
24. 24.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
25. 25.True or false: a grippy rubber sole gives less friction. (a) True (b) False
26. 26.True or false: powder on a carrom board gives less friction. (a) False (b) True
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
29. 29.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a rough doormat (d) sand on a slippery path
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
35. 35.True or false: a wet tiled floor gives more friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
39. 39.True or false: chalk on a gym bar gives less friction. (a) True (b) False
40. 40.🛞 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 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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