Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 899 · 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, sandpaper 9 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
3. 3.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
4. 4.True or false: sand on a slippery path gives more friction. (a) True (b) False
5. 5.🛞 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 3 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
7. 7.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
8. 8.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.True or false: chalk on a gym bar gives less friction. (a) True (b) False
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a smooth steel slide (d) a tyre with deep treads
13. 13.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
14. 14.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) sand on a slippery path (d) chalk on a gym bar
18. 18.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
20. 20.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a tyre with deep treads (d) a wheel on ball bearings
21. 21.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 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, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
25. 25.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
27. 27.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) sand on a slippery path (d) skating on ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
30. 30.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
31. 31.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 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 10 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.🛞 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 carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
36. 36.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.🛞 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 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: a smooth steel slide gives more friction. (a) True (b) False

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