Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 793 · 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 grippy rubber sole (b) powder on a carrom board (c) a wheel on ball bearings (d) skating on ice
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
4. 4.True or false: a box pushed on carpet gives less friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a box pushed on carpet (d) sand on a slippery path
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.True or false: sand on a slippery path gives more friction. (a) True (b) False
12. 12.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
14. 14.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) oil on a squeaky hinge (d) a box pushed on carpet
15. 15.🛞 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, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 10 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
17. 17.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a wheel on ball bearings (d) a wet tiled floor
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a smooth steel slide (d) sand on a slippery path
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 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?
20. 20.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
21. 21.True or false: sand on a slippery path gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
23. 23.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
26. 26.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
27. 27.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
31. 31.True or false: a box pushed on carpet gives more friction. (a) False (b) True
32. 32.🛞 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 wooden plank 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a box pushed on carpet (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 11 N, ice 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
35. 35.True or false: a smooth steel slide gives more friction. (a) True (b) False
36. 36.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
37. 37.True or false: a wet tiled floor gives less friction. (a) False (b) True
38. 38.True or false: powder on a carrom board gives less friction. (a) False (b) True
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
40. 40.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction

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