Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 592 · 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.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a wet tiled floor (d) a wheel on ball bearings
7. 7.🛞 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, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
8. 8.True or false: a rough doormat gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a grippy rubber sole (d) sand on a slippery path
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) powder on a carrom board (d) a grippy rubber sole
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
13. 13.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
14. 14.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
17. 17.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
23. 23.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a rough doormat (d) a tyre with deep treads
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 5 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 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 11 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
26. 26.True or false: skating on ice gives less friction. (a) False (b) True
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
28. 28.True or false: chalk on a gym bar 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 3 N, a wooden plank 6 N, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
30. 30.True or false: a wet tiled floor gives more friction. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.🛞 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 8 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
34. 34.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) oil on a squeaky hinge (d) skating on ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wet tiled floor (d) a wheel on ball bearings
38. 38.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
39. 39.True or false: a box pushed on carpet gives more friction. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a grippy rubber sole (d) a smooth steel slide

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