Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 634 · 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: sand on a slippery path? (a) less friction (b) more friction
2. 2.True or false: a tyre with deep treads gives more friction. (a) True (b) False
3. 3.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a smooth steel slide (d) oil on a squeaky hinge
5. 5.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
6. 6.🛞 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, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
7. 7.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a smooth steel slide (d) a grippy rubber sole
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
9. 9.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
10. 10.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.True or false: chalk on a gym bar gives less friction. (a) True (b) False
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
16. 16.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 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) ice (c) a glass sheet (d) a carpet
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a box pushed on carpet (d) a wet tiled floor
20. 20.🛞 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 9 N, a carpet 13 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a smooth steel slide (d) a wet tiled floor
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
27. 27.True or false: skating on ice gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a tyre with deep treads (d) a wheel on ball bearings
30. 30.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) skating on ice (d) a box pushed on carpet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 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: a glass sheet 5 N, a wooden plank 9 N, a carpet 13 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
36. 36.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) oil on a squeaky hinge (d) chalk on a gym bar
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 11 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet

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