Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 404 · 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.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
2. 2.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 16 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) chalk on a gym bar (d) a smooth steel slide
12. 12.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
13. 13.🛞 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 wooden plank 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
14. 14.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.True or false: a rough doormat gives more friction. (a) False (b) True
16. 16.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
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 5 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a tyre with deep treads (d) sand on a slippery path
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
20. 20.True or false: a smooth steel slide gives more friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
24. 24.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a tyre with deep treads
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a wet tiled floor (d) a rough doormat
28. 28.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
29. 29.True or false: a grippy rubber sole gives more friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) sand on a slippery path (d) oil on a squeaky hinge
32. 32.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 3 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
36. 36.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wheel on ball bearings (d) a grippy rubber sole
37. 37.🛞 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 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on ice?
38. 38.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
39. 39.True or false: chalk on a gym bar gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank

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