Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 995 · 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: sand on a slippery path? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
3. 3.🛞 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 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a smooth steel slide (d) a rough doormat
10. 10.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) oil on a squeaky hinge
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
14. 14.True or false: a box pushed on carpet gives less friction. (a) True (b) False
15. 15.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
16. 16.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
17. 17.True or false: sand on a slippery path gives less friction. (a) True (b) False
18. 18.True or false: a rough doormat gives more friction. (a) False (b) True
19. 19.🛞 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, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a tyre with deep treads (d) a wheel on ball bearings
21. 21.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
23. 23.True or false: chalk on a gym bar gives less 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 8 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
27. 27.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
28. 28.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
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: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🛞 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 10 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
32. 32.True or false: a tyre with deep treads gives more friction. (a) False (b) True
33. 33.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
38. 38.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wet tiled floor (d) chalk on a gym bar
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a wheel on ball bearings (d) a rough doormat
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet

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