Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 245 · 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: sandpaper 10 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wheel on ball bearings
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a wet tiled floor (d) oil on a squeaky hinge
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
11. 11.🛞 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, ice 1 N. How many newtons more were needed on a carpet than on ice?
12. 12.True or false: chalk on a gym bar gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
14. 14.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
15. 15.True or false: a grippy rubber sole gives less friction. (a) False (b) True
16. 16.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) sand on a slippery path (d) a tyre with deep treads
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
19. 19.True or false: skating on ice gives less friction. (a) True (b) False
20. 20.True or false: a smooth steel slide gives more friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
24. 24.True or false: sand on a slippery path gives more friction. (a) True (b) False
25. 25.True or false: powder on a carrom board gives more friction. (a) True (b) False
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a box pushed on carpet (d) chalk on a gym bar
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
30. 30.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wet tiled floor (d) oil on a squeaky hinge
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a tyre with deep treads (d) chalk on a gym bar
33. 33.True or false: a tyre with deep treads 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: a carpet 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
35. 35.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a smooth steel slide (d) a wheel on ball bearings
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) powder on a carrom board (d) skating on ice
39. 39.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet

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