Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 606 · 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.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
2. 2.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
5. 5.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.True or false: a grippy rubber sole gives more friction. (a) False (b) True
8. 8.🛞 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 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) powder on a carrom board (d) a wet tiled floor
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a tyre with deep treads (d) a smooth steel slide
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a tyre with deep treads (d) a box pushed on carpet
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
29. 29.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
31. 31.True or false: a smooth steel slide gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
33. 33.🛞 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 7 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
36. 36.True or false: skating on ice gives less friction. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) oil on a squeaky hinge (d) skating on ice
38. 38.True or false: sand on a slippery path gives more friction. (a) True (b) False
39. 39.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?

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