Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 303 · 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.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) oil on a squeaky hinge (d) a rough doormat
2. 2.True or false: a grippy rubber sole gives more friction. (a) True (b) False
3. 3.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a box pushed on carpet (d) a rough doormat
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
7. 7.True or false: a smooth steel slide gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
9. 9.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a wheel on ball bearings (d) a wet tiled floor
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
13. 13.🛞 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 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
14. 14.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) oil on a squeaky hinge (d) a tyre with deep treads
15. 15.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
18. 18.True or false: a box pushed on carpet gives less friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
21. 21.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
27. 27.True or false: sand on a slippery path gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 10 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a rough doormat (d) a smooth steel slide
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) powder on a carrom board (d) a box pushed on carpet
33. 33.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
36. 36.True or false: a wet tiled floor gives less friction. (a) True (b) False
37. 37.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
40. 40.True or false: a box pushed on carpet gives more friction. (a) True (b) False

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