Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 668 · 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: powder on a carrom board? (a) more friction (b) less friction
2. 2.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a box pushed on carpet (d) a rough doormat
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a wet tiled floor (d) oil on a squeaky hinge
6. 6.True or false: a tyre with deep treads gives less friction. (a) True (b) False
7. 7.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
8. 8.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
10. 10.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
11. 11.True or false: a wet tiled floor gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 12 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
17. 17.🛞 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 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a tyre with deep treads (d) chalk on a gym bar
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) powder on a carrom board (d) sand on a slippery path
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
23. 23.True or false: powder on a carrom board gives less friction. (a) True (b) False
24. 24.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
25. 25.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
26. 26.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
27. 27.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
28. 28.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
29. 29.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) chalk on a gym bar (d) a box pushed on carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
31. 31.True or false: a box pushed on carpet gives less friction. (a) True (b) False
32. 32.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
33. 33.🛞 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, a carpet 13 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 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 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
35. 35.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
37. 37.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
39. 39.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
40. 40.🛞 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, a carpet 9 N. How many newtons more were needed on a carpet than on ice?

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