Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 290 · 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.🛞 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 wooden plank 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
2. 2.True or false: powder on a carrom board gives less friction. (a) False (b) True
3. 3.True or false: sand on a slippery path gives less friction. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
5. 5.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) chalk on a gym bar (d) skating on ice
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a box pushed on carpet (d) a rough doormat
7. 7.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
8. 8.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a wet tiled floor (d) powder on a carrom board
10. 10.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
12. 12.True or false: a smooth steel slide gives less friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
14. 14.True or false: sand on a slippery path gives more friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.True or false: skating on ice gives more friction. (a) False (b) True
17. 17.True or false: a tyre with deep treads gives less friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
19. 19.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a box pushed on carpet (d) a tyre with deep treads
22. 22.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
23. 23.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a box pushed on carpet (d) a rough doormat
25. 25.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
29. 29.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) sand on a slippery path
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
32. 32.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a box pushed on carpet (d) oil on a squeaky hinge
33. 33.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) skating on ice (d) a smooth steel slide
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
35. 35.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
39. 39.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet

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