Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 957 · 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 rough doormat (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wheel on ball bearings
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a tyre with deep treads (d) a smooth steel slide
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) a wet tiled floor
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a wheel on ball bearings (d) a rough doormat
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
7. 7.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
8. 8.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only 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 7 N, sandpaper 9 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
10. 10.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a box pushed on carpet (d) a grippy rubber sole
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.True or false: a rough doormat gives more friction. (a) True (b) False
14. 14.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
16. 16.True or false: a grippy rubber sole gives more friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
19. 19.True or false: a smooth steel slide gives more friction. (a) False (b) True
20. 20.True or false: a rough doormat gives less friction. (a) False (b) True
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) powder on a carrom board (d) a wet tiled floor
25. 25.True or false: chalk on a gym bar gives more friction. (a) True (b) False
26. 26.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
27. 27.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
28. 28.True or false: chalk on a gym bar gives less friction. (a) False (b) True
29. 29.True or false: a box pushed on carpet gives less friction. (a) False (b) True
30. 30.True or false: a wet tiled floor gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 15 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
33. 33.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a grippy rubber sole (d) a smooth steel slide
34. 34.True or false: a tyre with deep treads gives less friction. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) powder on a carrom board (d) a box pushed on carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
38. 38.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
40. 40.True or false: skating on ice gives more friction. (a) True (b) False

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