Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 703 · 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: powder on a carrom board gives more friction. (a) True (b) False
2. 2.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
7. 7.True or false: sand on a slippery path gives more friction. (a) True (b) False
8. 8.🛞 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 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
9. 9.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) powder on a carrom board (d) sand on a slippery path
11. 11.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
12. 12.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
13. 13.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a grippy rubber sole
15. 15.🛞 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. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.True or false: chalk on a gym bar gives more friction. (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 15 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: a wheel on ball bearings gives more 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 6 N, a carpet 9 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
25. 25.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) powder on a carrom board (d) a rough doormat
32. 32.🛞 More or less friction: a smooth steel slide? (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 5 N, a wooden plank 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
34. 34.🛞 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 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a rough doormat (d) oil on a squeaky hinge
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a rough doormat (d) sand on a slippery path
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
39. 39.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?

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