Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 477 · 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.True or false: sand on a slippery path gives more friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
4. 4.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) skating on ice (d) chalk on a gym bar
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a grippy rubber sole (d) chalk on a gym bar
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
11. 11.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
12. 12.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
13. 13.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) chalk on a gym bar (d) a smooth steel slide
15. 15.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) oil on a squeaky hinge (d) sand on a slippery path
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a grippy rubber sole (d) chalk on a gym bar
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
18. 18.True or false: skating on ice gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
20. 20.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) oil on a squeaky hinge (d) chalk on a gym bar
21. 21.True or false: a wet tiled floor gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a box pushed on carpet (d) a tyre with deep treads
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wheel on ball bearings (d) powder on a carrom board
28. 28.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
29. 29.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
30. 30.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a wheel on ball bearings
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
32. 32.True or false: a rough doormat gives more friction. (a) True (b) False
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
35. 35.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
36. 36.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
39. 39.🛞 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 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?

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