Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 235 · 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.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
3. 3.True or false: powder on a carrom board gives more friction. (a) True (b) False
4. 4.True or false: chalk on a gym bar gives less friction. (a) False (b) True
5. 5.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) a grippy rubber sole (d) a tyre with deep treads
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
9. 9.True or false: sand on a slippery path gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a wheel on ball bearings (d) oil on a squeaky hinge
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) a wet tiled floor
17. 17.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
18. 18.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
23. 23.True or false: sand on a slippery path gives less friction. (a) False (b) True
24. 24.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
25. 25.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
26. 26.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) chalk on a gym bar (d) a grippy rubber sole
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
31. 31.🛞 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 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
32. 32.🛞 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 11 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: a rough doormat gives less friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
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 8 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice

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