Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 570 · 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.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
2. 2.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
3. 3.🛞 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 carpet 12 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a rough doormat (d) skating on ice
7. 7.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) chalk on a gym bar (d) a smooth steel slide
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
11. 11.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a rough doormat (d) a tyre with deep treads
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 11 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
15. 15.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a wet tiled floor (d) a smooth steel slide
16. 16.True or false: skating on ice gives more friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
18. 18.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
19. 19.🛞 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, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
20. 20.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
21. 21.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
22. 22.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
23. 23.🛞 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 10 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
24. 24.🛞 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 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
27. 27.🛞 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 8 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
28. 28.True or false: a smooth steel slide gives more friction. (a) False (b) True
29. 29.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
30. 30.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
31. 31.True or false: a rough doormat gives more friction. (a) False (b) True
32. 32.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
35. 35.🛞 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, sandpaper 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: sand on a slippery path gives less friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) a wet tiled floor
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a grippy rubber sole (d) skating on ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet

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