Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 233 · 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: a box pushed on carpet gives less friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
6. 6.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a rough doormat (d) sand on a slippery path
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 14 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
9. 9.True or false: powder on a carrom board gives more friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a smooth steel slide (d) sand on a slippery path
12. 12.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a smooth steel slide (d) a rough doormat
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.🛞 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 9 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
18. 18.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a grippy rubber sole (d) oil on a squeaky hinge
19. 19.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
20. 20.True or false: sand on a slippery path gives more friction. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a tyre with deep treads (d) a smooth steel slide
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
23. 23.True or false: chalk on a gym bar gives more friction. (a) False (b) True
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) skating on ice (d) a smooth steel slide
26. 26.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
27. 27.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
30. 30.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
31. 31.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
32. 32.🛞 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 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
33. 33.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a rough doormat (d) a tyre with deep treads
34. 34.True or false: a grippy rubber sole gives less friction. (a) False (b) True
35. 35.True or false: a rough doormat gives more friction. (a) False (b) True
36. 36.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
37. 37.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
39. 39.True or false: skating on ice gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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