Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 183 · 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 2 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
2. 2.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) sand on a slippery path (d) skating on ice
3. 3.True or false: sand on a slippery path gives more friction. (a) False (b) True
4. 4.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a grippy rubber sole (d) oil on a squeaky hinge
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
9. 9.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
10. 10.True or false: a rough doormat gives more friction. (a) False (b) True
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a wet tiled floor (d) skating on ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
18. 18.True or false: a grippy rubber sole gives more friction. (a) False (b) True
19. 19.True or false: a rough doormat gives less friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) chalk on a gym bar (d) powder on a carrom board
21. 21.True or false: a grippy rubber sole gives less friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a smooth steel slide (d) a rough doormat
25. 25.True or false: chalk on a gym bar gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
27. 27.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
29. 29.True or false: oil on a squeaky hinge 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: a carpet 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) chalk on a gym bar (d) a tyre with deep treads
32. 32.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) oil on a squeaky hinge (d) powder on a carrom board
33. 33.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.True or false: skating on ice gives less friction. (a) True (b) False
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 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
37. 37.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 6 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet

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