Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 168 · 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 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
3. 3.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) a rough doormat
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) a smooth steel slide
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) oil on a squeaky hinge (d) chalk on a gym bar
6. 6.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
7. 7.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) sand on a slippery path (d) skating on ice
8. 8.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
9. 9.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
10. 10.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
11. 11.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
12. 12.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.🛞 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, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a smooth steel slide (d) oil on a squeaky hinge
19. 19.🛞 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 11 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 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 glass sheet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
21. 21.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
22. 22.True or false: a box pushed on carpet gives more friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 15 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
27. 27.True or false: a grippy rubber sole gives less friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: skating on ice gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
32. 32.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
36. 36.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
37. 37.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
38. 38.🛞 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 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper

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