Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 934 · 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: shoe soles wearing out? (a) helpful (b) a problem
2. 2.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
5. 5.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a rough doormat (d) a wheel on ball bearings
6. 6.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
7. 7.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
8. 8.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
9. 9.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
13. 13.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
14. 14.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
18. 18.True or false: chalk on a gym bar gives more friction. (a) False (b) True
19. 19.True or false: a smooth steel slide gives more friction. (a) True (b) False
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 carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 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 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
23. 23.🛞 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 wooden plank 9 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
24. 24.🛞 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 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
25. 25.True or false: a tyre with deep treads gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
28. 28.True or false: a box pushed on carpet gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, sandpaper 14 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 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, sandpaper 9 N, ice 1 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 wooden plank 4 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
32. 32.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a rough doormat (d) a tyre with deep treads
33. 33.True or false: powder on a carrom board gives more friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a rough doormat (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 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
36. 36.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) powder on a carrom board (d) a wheel on ball bearings
39. 39.🛞 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 8 N, a carpet 12 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
40. 40.True or false: chalk on a gym bar gives less friction. (a) False (b) True

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