Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 260 · 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 glass sheet 5 N, a carpet 9 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
5. 5.🛞 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 10 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a smooth steel slide (d) chalk on a gym bar
7. 7.🛞 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 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
8. 8.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
9. 9.True or false: chalk on a gym bar gives more friction. (a) True (b) False
10. 10.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
11. 11.True or false: a rough doormat gives more friction. (a) True (b) False
12. 12.🛞 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, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 14 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
20. 20.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
22. 22.🛞 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, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) oil on a squeaky hinge (d) a box pushed on carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
25. 25.🛞 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 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 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: a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
29. 29.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) skating on ice (d) a box pushed on carpet
30. 30.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
31. 31.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) oil on a squeaky hinge (d) a tyre with deep treads
32. 32.🛞 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 12 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
34. 34.True or false: a tyre with deep treads gives less friction. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a wet tiled floor (d) a rough doormat
36. 36.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
37. 37.🛞 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 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, sandpaper 16 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
39. 39.True or false: skating on ice gives less friction. (a) True (b) False
40. 40.🛞 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 10 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice

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