Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 765 · 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: machine parts heating up? (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 9 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
3. 3.True or false: a rough doormat gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
8. 8.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
10. 10.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
11. 11.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
12. 12.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a box pushed on carpet (d) a tyre with deep treads
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
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 15 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) sand on a slippery path (d) skating on ice
19. 19.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a tyre with deep treads (d) a grippy rubber sole
22. 22.True or false: skating on ice gives more friction. (a) True (b) False
23. 23.True or false: a box pushed on carpet gives more friction. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a wet tiled floor (d) a wheel on ball bearings
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
27. 27.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
30. 30.True or false: a smooth steel slide gives more friction. (a) True (b) False
31. 31.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a rough doormat
33. 33.🛞 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 carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
34. 34.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) oil on a squeaky hinge (d) a grippy rubber sole
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful

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