Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 598 · 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.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
4. 4.🛞 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 8 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
5. 5.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
6. 6.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
8. 8.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) oil on a squeaky hinge (d) sand on a slippery path
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
12. 12.True or false: a rough doormat gives less friction. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) chalk on a gym bar (d) a wet tiled floor
14. 14.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.True or false: chalk on a gym bar gives less friction. (a) True (b) False
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a rough doormat (d) a box pushed on carpet
19. 19.True or false: a grippy rubber sole gives more friction. (a) False (b) True
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
22. 22.True or false: chalk on a gym bar gives more friction. (a) True (b) False
23. 23.🛞 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. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
26. 26.True or false: a wet tiled floor gives less friction. (a) False (b) True
27. 27.🛞 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, a carpet 11 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
28. 28.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) skating on ice (d) a wet tiled floor
29. 29.True or false: a smooth steel slide gives less friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) skating on ice (d) a rough doormat
31. 31.🛞 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 wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) skating on ice (d) a wet tiled floor
34. 34.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a rough doormat (d) a grippy rubber sole
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) sand on a slippery path (d) a tyre with deep treads

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