Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 751 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
3. 3.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) chalk on a gym bar (d) sand on a slippery path
5. 5.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 6 N, ice 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
10. 10.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
12. 12.True or false: a grippy rubber sole gives less friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wheel on ball bearings (d) a grippy rubber sole
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a tyre with deep treads (d) a smooth steel slide
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
20. 20.🛞 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 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
21. 21.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a rough doormat (d) a box pushed on carpet
23. 23.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
25. 25.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
26. 26.True or false: a tyre with deep treads 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: ice 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
28. 28.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
30. 30.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
34. 34.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
35. 35.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
37. 37.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
38. 38.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a wheel on ball bearings
39. 39.True or false: skating on ice gives more friction. (a) True (b) False
40. 40.True or false: a grippy rubber sole gives more friction. (a) True (b) False

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