Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 212 · 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.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
3. 3.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) powder on a carrom board (d) chalk on a gym bar
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
9. 9.True or false: a tyre with deep treads gives less friction. (a) False (b) True
10. 10.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) skating on ice (d) a wet tiled floor
12. 12.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a box pushed on carpet (d) a rough doormat
13. 13.🛞 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 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.True or false: a rough doormat gives less friction. (a) True (b) False
15. 15.🛞 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 8 N, ice 1 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
16. 16.🛞 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 12 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
17. 17.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
18. 18.True or false: a grippy rubber sole gives more friction. (a) False (b) True
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
21. 21.🛞 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) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
22. 22.True or false: powder on a carrom board gives less friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) sand on a slippery path (d) a smooth steel slide
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
25. 25.True or false: powder on a carrom board gives more 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 5 N, a carpet 8 N, sandpaper 10 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.True or false: skating on ice gives less friction. (a) False (b) True
28. 28.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
29. 29.True or false: a wet tiled floor gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
31. 31.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🛞 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 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
36. 36.True or false: a wet tiled floor gives more friction. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a smooth steel slide (d) a rough doormat
38. 38.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
39. 39.🛞 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, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) sand on a slippery path (d) a wheel on ball bearings

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