Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 524 · 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.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
2. 2.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
3. 3.🛞 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, sandpaper 10 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
5. 5.True or false: a wet tiled floor gives less friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
9. 9.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
11. 11.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
12. 12.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a tyre with deep treads (d) a rough doormat
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
16. 16.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) powder on a carrom board (d) a wet tiled floor
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
23. 23.True or false: a smooth steel slide gives less friction. (a) True (b) False
24. 24.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
30. 30.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) oil on a squeaky hinge (d) skating on ice
31. 31.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
35. 35.True or false: chalk on a gym bar gives less friction. (a) False (b) True
36. 36.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 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 8 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
39. 39.True or false: sand on a slippery path gives more friction. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a wet tiled floor (d) oil on a squeaky hinge

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