Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 682 · 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.True or false: chalk on a gym bar gives less friction. (a) False (b) True
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a smooth steel slide (d) a rough doormat
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
7. 7.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) chalk on a gym bar (d) a wheel on ball bearings
9. 9.True or false: skating on ice gives more friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) oil on a squeaky hinge (d) a box pushed on carpet
11. 11.🛞 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 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) oil on a squeaky hinge (d) a tyre with deep treads
13. 13.True or false: a rough doormat gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
15. 15.True or false: powder on a carrom board gives less friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
17. 17.True or false: a smooth steel slide gives less friction. (a) True (b) False
18. 18.True or false: skating on ice gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
20. 20.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
21. 21.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) chalk on a gym bar (d) oil on a squeaky hinge
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 8 N, a carpet 12 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.True or false: a tyre with deep treads gives less friction. (a) False (b) True
25. 25.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) skating on ice (d) a rough doormat
28. 28.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
33. 33.🛞 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, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
34. 34.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
35. 35.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
36. 36.True or false: a grippy rubber sole gives more friction. (a) True (b) False
37. 37.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a grippy rubber sole
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber

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