Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 425 · 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.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a grippy rubber sole (d) skating on ice
2. 2.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
3. 3.🛞 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 7 N, a wooden plank 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
4. 4.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
6. 6.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) powder on a carrom board (d) a wheel on ball bearings
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a wet tiled floor (d) chalk on a gym bar
10. 10.🛞 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 2 N, a wooden plank 4 N. How many newtons more were needed on a carpet than on ice?
11. 11.True or false: a wet tiled floor gives more friction. (a) False (b) True
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a grippy rubber sole (d) a box pushed on carpet
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
15. 15.True or false: a box pushed on carpet gives more friction. (a) True (b) False
16. 16.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
17. 17.True or false: a rough doormat gives more friction. (a) False (b) True
18. 18.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
19. 19.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: a rough doormat gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 15 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
26. 26.🛞 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 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
27. 27.True or false: powder on a carrom board 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 7 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, a carpet 13 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
36. 36.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a wheel on ball bearings (d) a wet tiled floor
37. 37.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wheel on ball bearings
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper

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