Engineering Worksheet: Friction

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

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