Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 936 · 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 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) skating on ice (d) oil on a squeaky hinge
3. 3.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a wheel on ball bearings (d) a tyre with deep treads
5. 5.🛞 More or less friction: a wet tiled floor? (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 6 N, a carpet 7 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 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. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
12. 12.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
16. 16.True or false: sand on a slippery path gives more friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
19. 19.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
20. 20.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) skating on ice (d) a rough doormat
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wheel on ball bearings
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
25. 25.True or false: a grippy rubber sole gives less friction. (a) False (b) True
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 glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.True or false: a tyre with deep treads gives more friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a tyre with deep treads (d) oil on a squeaky hinge
33. 33.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
34. 34.🛞 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 most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a box pushed on carpet (d) powder on a carrom board
37. 37.True or false: a smooth steel slide gives less friction. (a) True (b) False
38. 38.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
39. 39.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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