Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 533 · 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.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a grippy rubber sole
5. 5.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
8. 8.🛞 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. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
12. 12.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
14. 14.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
15. 15.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wheel on ball bearings (d) sand on a slippery path
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
17. 17.True or false: a smooth steel slide 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 5 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a tyre with deep treads (d) a box pushed on carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
24. 24.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
25. 25.True or false: a tyre with deep treads gives more friction. (a) True (b) False
26. 26.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
27. 27.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
29. 29.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
32. 32.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
35. 35.True or false: a box pushed on carpet gives less friction. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
37. 37.🛞 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 wooden plank 10 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
38. 38.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
39. 39.🛞 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 wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
40. 40.True or false: a rough doormat gives more friction. (a) False (b) True

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