Engineering Worksheet: Friction

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

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