Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 967 · 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: chalk on a gym bar? (a) more friction (b) less friction
2. 2.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
5. 5.🛞 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 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
7. 7.True or false: a smooth steel slide gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wet tiled floor (d) a rough doormat
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) chalk on a gym bar (d) oil on a squeaky hinge
12. 12.True or false: a smooth steel slide gives more friction. (a) False (b) True
13. 13.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
14. 14.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
15. 15.True or false: a tyre with deep treads gives less friction. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) chalk on a gym bar (d) a rough doormat
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 12 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) chalk on a gym bar (d) a smooth steel slide
19. 19.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
20. 20.True or false: a rough doormat gives less friction. (a) True (b) False
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
23. 23.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.🛞 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 15 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
28. 28.True or false: skating on ice gives less friction. (a) True (b) False
29. 29.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 14 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
31. 31.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a grippy rubber sole (d) oil on a squeaky hinge
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a wet tiled floor (d) a wheel on ball bearings
37. 37.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
39. 39.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful

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