Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 688 · 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) press parts harder (c) add sand (d) oil the moving parts
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
5. 5.True or false: a tyre with deep treads gives less friction. (a) False (b) True
6. 6.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
7. 7.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) powder on a carrom board (d) a box pushed on carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
11. 11.🛞 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 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
14. 14.True or false: skating on ice gives more friction. (a) False (b) True
15. 15.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
19. 19.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a grippy rubber sole (d) skating on ice
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) chalk on a gym bar (d) a smooth steel slide
23. 23.True or false: sand on a slippery path gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
26. 26.True or false: powder on a carrom board gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
28. 28.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, sandpaper 14 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) sand on a slippery path (d) a wet tiled floor
31. 31.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
32. 32.True or false: skating on ice gives less friction. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a smooth steel slide (d) a box pushed on carpet
34. 34.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a wheel on ball bearings (d) a rough doormat
35. 35.🛞 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, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
37. 37.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a rough doormat
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm

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