Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 670 · 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 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wheel on ball bearings (d) a rough doormat
4. 4.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
5. 5.🛞 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 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) powder on a carrom board (d) oil on a squeaky hinge
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
11. 11.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
12. 12.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) skating on ice (d) a box pushed on carpet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 5 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
17. 17.True or false: a rough doormat gives less 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 5 N, a carpet 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
20. 20.True or false: chalk on a gym bar gives less friction. (a) False (b) True
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
23. 23.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
25. 25.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
26. 26.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a grippy rubber sole (d) chalk on a gym bar
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a tyre with deep treads (d) a rough doormat
28. 28.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.True or false: a grippy rubber sole gives more friction. (a) False (b) True
32. 32.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
33. 33.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 13 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.True or false: a rough doormat gives more friction. (a) False (b) True
40. 40.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand

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