Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 666 · 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) a grippy rubber sole (b) a smooth steel slide (c) sand on a slippery path (d) a box pushed on carpet
2. 2.True or false: a box pushed on carpet gives more friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
4. 4.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
5. 5.True or false: a smooth steel slide gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
7. 7.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
12. 12.True or false: a wet tiled floor gives less friction. (a) False (b) True
13. 13.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
15. 15.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
18. 18.🛞 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 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
19. 19.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a wheel on ball bearings (d) oil on a squeaky hinge
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
21. 21.🛞 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 wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
22. 22.True or false: a grippy rubber sole gives less friction. (a) True (b) False
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) chalk on a gym bar (d) powder on a carrom board
25. 25.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
26. 26.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) chalk on a gym bar (d) a box pushed on carpet
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 14 N, ice 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
29. 29.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
31. 31.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a smooth steel slide (d) a rough doormat
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
35. 35.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
36. 36.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wet tiled floor
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 2 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
38. 38.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
39. 39.🛞 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 carpet 11 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem

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