Engineering Worksheet: Friction

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

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