Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 789 · 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: ice 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
6. 6.🛞 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 7 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
7. 7.True or false: a wet tiled floor gives less friction. (a) True (b) False
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
10. 10.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
11. 11.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
12. 12.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
14. 14.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
16. 16.True or false: sand on a slippery path gives less friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a box pushed on carpet
20. 20.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
21. 21.🛞 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, sandpaper 12 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
23. 23.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
24. 24.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
31. 31.True or false: a rough doormat gives less friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a wheel on ball bearings (d) chalk on a gym bar
34. 34.True or false: powder on a carrom board gives less friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) chalk on a gym bar (d) oil on a squeaky hinge
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
39. 39.🛞 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 4 N. How many newtons more were needed on a carpet than on ice?
40. 40.True or false: a wheel on ball bearings gives less friction. (a) False (b) True

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