Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 143 · 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 4 N, a glass sheet 8 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
2. 2.🛞 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 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
3. 3.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
5. 5.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
6. 6.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) sand on a slippery path (d) a rough doormat
7. 7.True or false: a grippy rubber sole gives more friction. (a) False (b) True
8. 8.True or false: sand on a slippery path gives more friction. (a) False (b) True
9. 9.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
10. 10.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
11. 11.True or false: sand on a slippery path gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 7 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
15. 15.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
16. 16.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
19. 19.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
20. 20.🛞 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 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
23. 23.🛞 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 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 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, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
29. 29.True or false: chalk on a gym bar gives less friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
31. 31.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
36. 36.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a rough doormat (d) powder on a carrom board
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem

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