Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 976 · 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: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
2. 2.True or false: a box pushed on carpet gives less friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) chalk on a gym bar (d) a smooth steel slide
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
5. 5.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a smooth steel slide
6. 6.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a box pushed on carpet (d) chalk on a gym bar
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) oil on a squeaky hinge (d) skating on ice
11. 11.🛞 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, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
12. 12.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) skating on ice (d) a grippy rubber sole
15. 15.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 2 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
19. 19.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
20. 20.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
21. 21.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
22. 22.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
24. 24.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
27. 27.True or false: powder on a carrom board gives more friction. (a) True (b) False
28. 28.True or false: a rough doormat gives less friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.True or false: skating on ice gives less friction. (a) True (b) False
31. 31.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
32. 32.True or false: a grippy rubber sole gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.True or false: sand on a slippery path gives more friction. (a) False (b) True
35. 35.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.True or false: a smooth steel slide gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
40. 40.True or false: a grippy rubber sole gives more friction. (a) True (b) False

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