Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 568 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) sand on a slippery path
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
5. 5.True or false: skating on ice gives more friction. (a) True (b) False
6. 6.🛞 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 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
8. 8.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
9. 9.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
12. 12.True or false: powder on a carrom board gives more friction. (a) True (b) False
13. 13.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a smooth steel slide (d) a rough doormat
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
17. 17.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a wheel on ball bearings (d) chalk on a gym bar
23. 23.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
24. 24.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
25. 25.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
26. 26.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
27. 27.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a tyre with deep treads
29. 29.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a rough doormat (d) a grippy rubber sole
30. 30.True or false: powder on a carrom board gives less friction. (a) True (b) False
31. 31.🛞 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 carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
33. 33.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
36. 36.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
37. 37.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
40. 40.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction

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