Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 545 · 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) wet (b) warm (c) magnetic (d) cold
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) chalk on a gym bar (d) a grippy rubber sole
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
4. 4.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a rough doormat (d) a smooth steel slide
5. 5.True or false: a box pushed on carpet gives more friction. (a) False (b) True
6. 6.True or false: powder on a carrom board gives less friction. (a) True (b) False
7. 7.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
8. 8.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a box pushed on carpet (d) powder on a carrom board
10. 10.🛞 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, sandpaper 13 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 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 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
12. 12.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
13. 13.True or false: a wet tiled floor gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
15. 15.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
19. 19.True or false: sand on a slippery path gives more friction. (a) False (b) True
20. 20.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
25. 25.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
26. 26.True or false: skating on ice gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
28. 28.True or false: a rough doormat gives less friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) sand on a slippery path (d) a rough doormat
32. 32.🛞 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, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
33. 33.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) powder on a carrom board (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 9 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
35. 35.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a tyre with deep treads
36. 36.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
37. 37.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a wheel on ball bearings (d) powder on a carrom board
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
40. 40.True or false: a grippy rubber sole gives less friction. (a) True (b) False

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