Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 950 · 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) a wheel on ball bearings (b) chalk on a gym bar (c) powder on a carrom board (d) skating on ice
2. 2.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
3. 3.True or false: a tyre with deep treads gives less friction. (a) False (b) True
4. 4.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) chalk on a gym bar (d) a rough doormat
6. 6.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
7. 7.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
8. 8.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
9. 9.True or false: chalk on a gym bar gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.True or false: a grippy rubber sole gives less friction. (a) False (b) True
12. 12.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
13. 13.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
15. 15.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) a tyre with deep treads (d) sand on a slippery path
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a box pushed on carpet (d) skating on ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
18. 18.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
22. 22.🛞 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 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 9 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
24. 24.True or false: a grippy rubber sole gives more friction. (a) True (b) False
25. 25.🛞 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 wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
27. 27.🛞 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, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
29. 29.True or false: chalk on a gym bar gives less 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 12 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a wheel on ball bearings (d) chalk on a gym bar
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
35. 35.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
38. 38.True or false: a rough doormat gives less friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) powder on a carrom board (d) a rough doormat
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction

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