Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 912 · 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: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
2. 2.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) a box pushed on carpet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.🛞 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 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) sand on a slippery path (d) a wheel on ball bearings
11. 11.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
12. 12.True or false: a tyre with deep treads gives less friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a smooth steel slide (d) chalk on a gym bar
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
16. 16.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
20. 20.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) chalk on a gym bar (d) a grippy rubber sole
22. 22.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
23. 23.True or false: a smooth steel slide gives less friction. (a) True (b) False
24. 24.True or false: skating on ice 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 7 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
27. 27.True or false: a wet tiled floor gives more friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
29. 29.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a grippy rubber sole (d) oil on a squeaky hinge
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
33. 33.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
36. 36.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
37. 37.🛞 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 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
39. 39.True or false: a grippy rubber sole 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 carpet 7 N, sandpaper 8 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper

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