Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 893 · 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 wet tiled floor gives more friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a grippy rubber sole
3. 3.🛞 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 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
4. 4.True or false: sand on a slippery path gives more friction. (a) False (b) True
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
9. 9.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) oil on a squeaky hinge (d) sand on a slippery path
10. 10.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
13. 13.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
14. 14.True or false: a rough doormat gives more friction. (a) False (b) True
15. 15.True or false: skating on ice gives less friction. (a) True (b) False
16. 16.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) sand on a slippery path (d) a rough doormat
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
20. 20.True or false: a rough doormat gives less friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
23. 23.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
24. 24.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
25. 25.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a tyre with deep treads (d) a rough doormat
26. 26.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
27. 27.True or false: a box pushed on carpet gives less friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 11 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: sand on a slippery path gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
31. 31.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
32. 32.🛞 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 wooden plank 9 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
33. 33.🛞 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 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
34. 34.True or false: a box pushed on carpet gives more friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
36. 36.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?

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