Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 849 · 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 wooden plank 8 N, a carpet 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
5. 5.True or false: powder on a carrom board gives more friction. (a) True (b) False
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
7. 7.🛞 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 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
8. 8.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a grippy rubber sole (d) skating on ice
12. 12.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.🛞 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 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a wheel on ball bearings (d) chalk on a gym bar
17. 17.True or false: a box pushed on carpet gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) a wheel on ball bearings
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
23. 23.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
25. 25.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) a smooth steel slide
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
30. 30.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
31. 31.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
33. 33.True or false: powder on a carrom board 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: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
40. 40.🛞 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. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper

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