Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 430 · 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: sand on a slippery path gives more friction. (a) True (b) False
2. 2.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
5. 5.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a wheel on ball bearings (d) a box pushed on carpet
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) sand on a slippery path (d) a wet tiled floor
7. 7.🛞 More or less friction: powder on a carrom board? (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 1 N, a glass sheet 3 N, a carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
9. 9.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
10. 10.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) skating on ice (d) a wet tiled floor
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
14. 14.True or false: powder on a carrom board gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a rough doormat (d) a tyre with deep treads
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
24. 24.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
25. 25.True or false: skating on ice gives less friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 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 wooden plank 6 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 10 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) ice (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 glass sheet 4 N, a carpet 5 N, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
32. 32.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
33. 33.🛞 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 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a grippy rubber sole (d) chalk on a gym bar
35. 35.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) sand on a slippery path
36. 36.True or false: a grippy rubber sole gives less friction. (a) True (b) False
37. 37.🛞 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 carpet 4 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
39. 39.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
40. 40.True or false: sand on a slippery path gives less friction. (a) True (b) False

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