Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 268 · 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 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
3. 3.True or false: a rough doormat gives less friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 2 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
6. 6.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
7. 7.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.True or false: a wet tiled floor gives more friction. (a) True (b) False
10. 10.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a grippy rubber sole (d) a smooth steel slide
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) sand on a slippery path (d) a grippy rubber sole
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
14. 14.True or false: a rough doormat gives more friction. (a) False (b) True
15. 15.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
16. 16.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
19. 19.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
22. 22.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
23. 23.True or false: a grippy rubber sole gives less friction. (a) False (b) True
24. 24.True or false: chalk on a gym bar gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
26. 26.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
28. 28.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
32. 32.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
35. 35.True or false: a grippy rubber sole gives more friction. (a) False (b) True
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
38. 38.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
39. 39.🛞 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 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice

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