Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 629 · 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: dragging a heavy box? (a) a problem (b) helpful
2. 2.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) sand on a slippery path (d) a rough doormat
3. 3.True or false: a smooth steel slide gives more friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.🛞 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. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a wooden plank 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 5 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
14. 14.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
16. 16.🛞 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 wooden plank 5 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
21. 21.True or false: skating on ice gives less friction. (a) False (b) True
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) sand on a slippery path (d) a rough doormat
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.True or false: a rough doormat gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wet tiled floor (d) oil on a squeaky hinge
30. 30.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a wet tiled floor (d) oil on a squeaky hinge
31. 31.🛞 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 12 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
33. 33.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) skating on ice (d) a wet tiled floor
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) a box pushed on carpet
35. 35.🛞 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 wooden plank 7 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
36. 36.True or false: chalk on a gym bar gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
39. 39.True or false: powder on a carrom board gives more friction. (a) True (b) False
40. 40.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion

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