Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 525 · 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.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
2. 2.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
4. 4.True or false: a smooth steel slide gives more friction. (a) True (b) False
5. 5.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) powder on a carrom board (d) a smooth steel slide
7. 7.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 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 8 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a box pushed on carpet (d) a tyre with deep treads
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
12. 12.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
13. 13.True or false: a rough doormat gives more friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 11 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 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 12 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
20. 20.🛞 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 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
21. 21.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
22. 22.True or false: a tyre with deep treads gives less friction. (a) False (b) True
23. 23.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a tyre with deep treads (d) skating on ice
25. 25.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
26. 26.True or false: sand on a slippery path 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: sandpaper 11 N, ice 2 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.True or false: a box pushed on carpet 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 1 N, a glass sheet 2 N, a wooden plank 3 N, sandpaper 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
34. 34.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) oil on a squeaky hinge (d) sand on a slippery path
35. 35.True or false: a wet tiled floor gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
37. 37.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
39. 39.🛞 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 5 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem

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