Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 725 · 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 6 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
2. 2.True or false: a box pushed on carpet gives more friction. (a) False (b) True
3. 3.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
7. 7.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
8. 8.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
10. 10.🛞 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 carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.True or false: chalk on a gym bar gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
14. 14.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
15. 15.True or false: a rough doormat gives less friction. (a) True (b) False
16. 16.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
17. 17.True or false: a grippy rubber sole gives more friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
19. 19.True or false: a grippy rubber sole gives less friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) skating on ice (d) chalk on a gym bar
21. 21.True or false: a rough doormat gives more friction. (a) True (b) False
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
24. 24.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a grippy rubber sole (d) a box pushed on carpet
26. 26.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
30. 30.🛞 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 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) sand on a slippery path (d) chalk on a gym bar
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) oil on a squeaky hinge (d) skating on ice
35. 35.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
37. 37.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 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. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) sand on a slippery path (d) a wheel on ball bearings

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