Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 83 · 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.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a tyre with deep treads
2. 2.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wet tiled floor (d) a rough doormat
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a smooth steel slide (d) skating on ice
4. 4.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
5. 5.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
6. 6.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
7. 7.True or false: a rough doormat gives less friction. (a) True (b) False
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) chalk on a gym bar (d) sand on a slippery path
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) sand on a slippery path (d) a smooth steel slide
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
14. 14.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
18. 18.🛞 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 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
19. 19.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
20. 20.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
21. 21.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
22. 22.True or false: a smooth steel slide gives less friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a rough doormat (d) a tyre with deep treads
25. 25.🛞 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 carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a smooth steel slide gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
28. 28.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
29. 29.🛞 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 6 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
30. 30.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) chalk on a gym bar (d) a wet tiled floor
32. 32.True or false: powder on a carrom board gives more friction. (a) True (b) False
33. 33.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
34. 34.True or false: skating on ice gives more friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
36. 36.True or false: a box pushed on carpet gives less friction. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) sand on a slippery path
38. 38.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
39. 39.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
40. 40.True or false: a wheel on ball bearings gives more friction. (a) True (b) False

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