Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 281 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
3. 3.True or false: powder on a carrom board gives more friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a box pushed on carpet (d) skating on ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 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 6 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
8. 8.🛞 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 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
10. 10.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a tyre with deep treads (d) a wheel on ball bearings
12. 12.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
13. 13.True or false: a smooth steel slide gives more friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
18. 18.🛞 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 carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
19. 19.True or false: skating on ice gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
22. 22.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
24. 24.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
25. 25.True or false: a smooth steel slide gives less friction. (a) False (b) True
26. 26.True or false: sand on a slippery path gives more friction. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) a tyre with deep treads
28. 28.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
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: a wooden plank 9 N, a carpet 10 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
31. 31.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
33. 33.True or false: chalk on a gym bar gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
36. 36.True or false: a box pushed on carpet gives more friction. (a) False (b) True
37. 37.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
39. 39.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
40. 40.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction

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