Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 825 · 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.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
3. 3.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 3 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
5. 5.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
10. 10.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
11. 11.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
12. 12.True or false: a smooth steel slide 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: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
16. 16.True or false: a smooth steel slide gives less friction. (a) True (b) False
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
18. 18.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
19. 19.True or false: sand on a slippery path gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
25. 25.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a rough doormat (d) sand on a slippery path
27. 27.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
28. 28.True or false: a tyre with deep treads gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
31. 31.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a grippy rubber sole (d) a tyre with deep treads
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) oil on a squeaky hinge (d) powder on a carrom board
35. 35.True or false: a grippy rubber sole gives more friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
37. 37.True or false: a grippy rubber sole gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
40. 40.True or false: skating on ice gives less friction. (a) False (b) True

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