Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 417 · 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: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (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: a carpet 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) skating on ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
7. 7.True or false: a wet tiled floor gives less friction. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a tyre with deep treads (d) oil on a squeaky hinge
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
10. 10.True or false: a grippy rubber sole gives more friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
12. 12.True or false: a tyre with deep treads gives more friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
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 7 N, a carpet 9 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
17. 17.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
19. 19.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a box pushed on carpet (d) a wet tiled floor
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
23. 23.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
26. 26.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
28. 28.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
29. 29.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
30. 30.🛞 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 8 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
34. 34.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
35. 35.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
36. 36.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
38. 38.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
39. 39.True or false: chalk on a gym bar gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank

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