Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 495 · 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.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) sand on a slippery path (d) a grippy rubber sole
3. 3.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 7 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a box pushed on carpet (d) oil on a squeaky hinge
6. 6.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
10. 10.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
11. 11.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
13. 13.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
15. 15.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
16. 16.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
17. 17.True or false: a box pushed on carpet gives more friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
19. 19.🛞 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, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
21. 21.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
22. 22.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
25. 25.True or false: a rough doormat gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
29. 29.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
30. 30.🛞 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 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
32. 32.True or false: powder on a carrom board gives more 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 3 N, a carpet 4 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) oil on a squeaky hinge (d) chalk on a gym bar
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 8 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) sand on a slippery path (d) powder on a carrom board
37. 37.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
39. 39.True or false: a box pushed on carpet gives less friction. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a smooth steel slide (d) a box pushed on carpet

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