Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 960 · 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: a carpet 8 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a tyre with deep treads (d) a wheel on ball bearings
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
5. 5.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
10. 10.True or false: sand on a slippery path gives less friction. (a) True (b) False
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
13. 13.True or false: powder on a carrom board gives more friction. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) skating on ice (d) a smooth steel slide
15. 15.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
19. 19.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
20. 20.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a wet tiled floor
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
22. 22.🛞 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, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🛞 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 most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
24. 24.True or false: powder on a carrom board gives less friction. (a) False (b) True
25. 25.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
30. 30.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.True or false: a rough doormat gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
35. 35.🛞 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, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
36. 36.True or false: a tyre with deep treads gives less friction. (a) True (b) False
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 carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
39. 39.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?

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