Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 334 · 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.True or false: a box pushed on carpet gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
4. 4.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a rough doormat (d) a wheel on ball bearings
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
7. 7.🛞 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 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
8. 8.True or false: powder on a carrom board gives less friction. (a) True (b) False
9. 9.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a wet tiled floor (d) a smooth steel slide
11. 11.🛞 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, ice 2 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
14. 14.True or false: a rough doormat gives less friction. (a) True (b) False
15. 15.True or false: a tyre with deep treads gives more friction. (a) False (b) True
16. 16.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
17. 17.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
18. 18.True or false: a tyre with deep treads gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
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 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a smooth steel slide (d) chalk on a gym bar
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
25. 25.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) skating on ice (d) a wheel on ball bearings
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
30. 30.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
31. 31.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
32. 32.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
36. 36.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) sand on a slippery path (d) oil on a squeaky hinge
37. 37.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) skating on ice (d) a wheel on ball bearings
39. 39.🛞 More or less friction: a rough doormat? (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 carpet 8 N, sandpaper 9 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice

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