Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 80 · 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: a carpet 11 N, ice 4 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
6. 6.True or false: a smooth steel slide gives less friction. (a) False (b) True
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) chalk on a gym bar (d) a wheel on ball bearings
9. 9.🛞 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 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
10. 10.True or false: chalk on a gym bar gives less friction. (a) False (b) True
11. 11.🛞 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) a carpet (b) a wooden plank (c) sandpaper (d) ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
13. 13.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
14. 14.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
15. 15.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
17. 17.🛞 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, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a wet tiled floor (d) oil on a squeaky hinge
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
22. 22.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
25. 25.True or false: a tyre with deep treads gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) skating on ice (d) a tyre with deep treads
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
30. 30.True or false: a grippy rubber sole gives more friction. (a) True (b) False
31. 31.🛞 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 wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
32. 32.🛞 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 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 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 wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a box pushed on carpet (d) a smooth steel slide
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a rough doormat (d) a wheel on ball bearings
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 14 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet

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