Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 88 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.True or false: sand on a slippery path gives more friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
4. 4.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
5. 5.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
7. 7.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
8. 8.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a smooth steel slide
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
14. 14.🛞 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 wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
15. 15.True or false: a tyre with deep treads gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
17. 17.True or false: a smooth steel slide gives more friction. (a) False (b) True
18. 18.True or false: skating on ice gives more friction. (a) True (b) False
19. 19.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
20. 20.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
21. 21.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a wet tiled floor (d) oil on a squeaky hinge
22. 22.🛞 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 wooden plank 5 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
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 wooden plank 12 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
26. 26.🛞 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 8 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
27. 27.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a grippy rubber sole (d) chalk on a gym bar
29. 29.True or false: chalk on a gym bar gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
32. 32.True or false: a grippy rubber sole gives less friction. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) sand on a slippery path (d) skating on ice
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
35. 35.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
36. 36.True or false: chalk on a gym bar gives more friction. (a) True (b) False
37. 37.True or false: a smooth steel slide gives less friction. (a) False (b) True
38. 38.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
39. 39.🛞 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. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction

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