Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 918 · 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.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
2. 2.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
3. 3.True or false: chalk on a gym bar gives more friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wheel on ball bearings (d) sand on a slippery path
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) powder on a carrom board (d) a wheel on ball bearings
6. 6.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
7. 7.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
10. 10.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
11. 11.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
12. 12.True or false: chalk on a gym bar gives less friction. (a) False (b) True
13. 13.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
19. 19.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) sand on a slippery path (d) a rough doormat
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
22. 22.🛞 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 8 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.True or false: powder on a carrom board gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
27. 27.🛞 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. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
29. 29.🛞 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 12 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
30. 30.🛞 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, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
35. 35.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) powder on a carrom board
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
37. 37.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
40. 40.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction

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