Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 361 · 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: chalk on a gym bar? (a) less friction (b) more friction
2. 2.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) skating on ice (d) a box pushed on carpet
3. 3.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a tyre with deep treads (d) powder on a carrom board
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
6. 6.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) sand on a slippery path (d) a grippy rubber sole
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a tyre with deep treads (d) oil on a squeaky hinge
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 11 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a rough doormat (d) powder on a carrom board
16. 16.True or false: sand on a slippery path gives less friction. (a) True (b) False
17. 17.True or false: a tyre with deep treads gives more friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a wet tiled floor (d) a smooth steel slide
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a grippy rubber sole (d) a smooth steel slide
20. 20.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
21. 21.True or false: skating on ice gives less friction. (a) True (b) False
22. 22.True or false: a grippy rubber sole gives more friction. (a) False (b) True
23. 23.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
25. 25.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
26. 26.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
28. 28.True or false: sand on a slippery path gives more friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, a carpet 13 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 8 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
35. 35.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
36. 36.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
37. 37.True or false: a box pushed on carpet gives more friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, a carpet 16 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 10 N, ice 2 N. How many newtons more were needed on a carpet than on ice?

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