Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 693 · 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.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
2. 2.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a wooden plank 3 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: ice 4 N, a glass sheet 8 N, a wooden plank 11 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
7. 7.🛞 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, ice 1 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
9. 9.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 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, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.True or false: a box pushed on carpet gives more friction. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a smooth steel slide (d) oil on a squeaky hinge
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) sand on a slippery path (d) a grippy rubber sole
18. 18.True or false: a box pushed on carpet gives less friction. (a) False (b) True
19. 19.True or false: sand on a slippery path gives more friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
22. 22.True or false: powder on a carrom board gives less friction. (a) True (b) False
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 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: a glass sheet 7 N, a carpet 8 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
26. 26.🛞 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 carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
28. 28.🛞 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 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
30. 30.🛞 More or less friction: a box pushed on carpet? (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 carpet 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a rough doormat (d) skating on ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
34. 34.True or false: chalk on a gym bar gives less friction. (a) True (b) False
35. 35.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
39. 39.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
40. 40.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem

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