Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 419 · 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 carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.True or false: sand on a slippery path gives less friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 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, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
6. 6.🛞 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 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
8. 8.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
9. 9.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
12. 12.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
14. 14.True or false: a rough doormat gives less friction. (a) True (b) False
15. 15.True or false: a smooth steel slide gives more friction. (a) False (b) True
16. 16.🛞 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, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
17. 17.True or false: chalk on a gym bar gives less friction. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) powder on a carrom board (d) skating on ice
19. 19.🛞 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 carpet 7 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: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) powder on a carrom board (d) a wet tiled floor
22. 22.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
23. 23.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a tyre with deep treads (d) a rough doormat
25. 25.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
26. 26.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a wet tiled floor (d) a box pushed on carpet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
30. 30.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
31. 31.🛞 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 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.True or false: powder on a carrom board gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.True or false: a rough doormat gives more friction. (a) False (b) True
37. 37.True or false: skating on ice gives more friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a smooth steel slide (d) sand on a slippery path
40. 40.True or false: sand on a slippery path gives more friction. (a) False (b) True

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