Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 695 · 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.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.True or false: sand on a slippery path gives less friction. (a) False (b) True
4. 4.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
5. 5.🛞 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 8 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
6. 6.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
7. 7.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
8. 8.🛞 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 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
10. 10.🛞 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 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 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 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) chalk on a gym bar (d) a smooth steel slide
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
17. 17.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
18. 18.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) powder on a carrom board (d) a box pushed on carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
21. 21.True or false: a wet tiled floor 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 2 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wheel on ball bearings (d) a smooth steel slide
25. 25.True or false: sand on a slippery path 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: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 12 N, a carpet 16 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 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 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
29. 29.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 7 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
33. 33.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) sand on a slippery path (d) oil on a squeaky hinge
35. 35.True or false: a box pushed on carpet 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: a glass sheet 3 N, a carpet 5 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
38. 38.True or false: a rough doormat gives more friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a box pushed on carpet (d) a wheel on ball bearings
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a rough doormat

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