Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 278 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
2. 2.True or false: skating on ice 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: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
4. 4.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
5. 5.🛞 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 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
6. 6.True or false: a box pushed on carpet gives more friction. (a) False (b) True
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
11. 11.🛞 More or less friction: a grippy rubber sole? (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.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a box pushed on carpet
17. 17.🛞 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 6 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a tyre with deep treads (d) a wet tiled floor
19. 19.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
20. 20.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
21. 21.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a smooth steel slide (d) chalk on a gym bar
23. 23.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
24. 24.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 14 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
28. 28.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a rough doormat (d) oil on a squeaky hinge
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.True or false: a wet tiled floor gives more friction. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a tyre with deep treads (d) a smooth steel slide
33. 33.True or false: a wet tiled floor gives less friction. (a) False (b) True
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
36. 36.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) skating on ice (d) powder on a carrom board
37. 37.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
38. 38.🛞 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 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
40. 40.True or false: a grippy rubber sole gives less friction. (a) False (b) True

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