Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 362 · 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: a box pushed on carpet gives more friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
3. 3.🛞 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 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.True or false: a grippy rubber sole gives less friction. (a) True (b) False
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
7. 7.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a rough doormat (d) skating on ice
8. 8.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) skating on ice (d) chalk on a gym bar
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
10. 10.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
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, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
15. 15.🛞 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 5 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
17. 17.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
19. 19.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
20. 20.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a box pushed on carpet (d) a rough doormat
22. 22.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a grippy rubber sole (d) sand on a slippery path
25. 25.True or false: a tyre with deep treads gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, a glass sheet 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet
31. 31.True or false: sand on a slippery path gives more friction. (a) True (b) False
32. 32.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
35. 35.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.True or false: sand on a slippery path gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet

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