Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 199 · 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 smooth steel slide gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a tyre with deep treads (d) a grippy rubber sole
4. 4.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.True or false: powder on a carrom board gives less friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
8. 8.🛞 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 7 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
9. 9.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
10. 10.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
11. 11.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
13. 13.🛞 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 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
14. 14.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a rough doormat (d) a grippy rubber sole
15. 15.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) a grippy rubber sole
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
20. 20.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) sand on a slippery path (d) chalk on a gym bar
23. 23.True or false: a wet tiled floor gives more friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 12 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
28. 28.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
29. 29.🛞 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 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
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 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
31. 31.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
33. 33.🛞 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 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) skating on ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
38. 38.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
39. 39.True or false: a box pushed on carpet gives less friction. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a wet tiled floor (d) a smooth steel slide

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