Engineering Worksheet: Friction

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

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