Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 729 · 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.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a rough doormat (d) sand on a slippery path
2. 2.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
3. 3.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
4. 4.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
5. 5.🛞 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 7 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
8. 8.True or false: a smooth steel slide gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 11 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 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, sandpaper 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
13. 13.🛞 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 wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
17. 17.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) powder on a carrom board (d) a rough doormat
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
24. 24.True or false: sand on a slippery path gives less friction. (a) False (b) True
25. 25.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
28. 28.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a wet tiled floor (d) a box pushed on carpet
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a tyre with deep treads (d) powder on a carrom board
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
32. 32.True or false: a box pushed on carpet gives less friction. (a) False (b) True
33. 33.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
34. 34.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.🛞 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, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
37. 37.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) sand on a slippery path (d) a rough doormat
38. 38.True or false: skating on ice gives more friction. (a) False (b) True
39. 39.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
40. 40.True or false: a tyre with deep treads gives more friction. (a) True (b) False

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