Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 945 · 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 6 N, a carpet 10 N, sandpaper 14 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 8 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a grippy rubber sole (d) a tyre with deep treads
6. 6.🛞 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 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
7. 7.True or false: skating on ice gives less friction. (a) False (b) True
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
9. 9.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a smooth steel slide (d) sand on a slippery path
11. 11.True or false: a wet tiled floor gives less friction. (a) False (b) True
12. 12.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
15. 15.🛞 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 wooden plank 3 N, a carpet 4 N. How many newtons more were needed on a carpet than on ice?
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) powder on a carrom board (d) a wheel on ball bearings
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a grippy rubber sole (d) a rough doormat
18. 18.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
19. 19.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
20. 20.True or false: a smooth steel slide gives more friction. (a) True (b) False
21. 21.True or false: a box pushed on carpet gives less friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
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: ice 1 N, a glass sheet 3 N, a carpet 4 N, sandpaper 5 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 wooden plank 3 N, a carpet 6 N, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
26. 26.True or false: a grippy rubber sole gives more friction. (a) True (b) False
27. 27.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
28. 28.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
30. 30.True or false: powder on a carrom board gives less friction. (a) False (b) True
31. 31.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a wheel on ball bearings (d) sand on a slippery path
35. 35.🛞 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 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
36. 36.True or false: powder on a carrom board gives more friction. (a) False (b) True
37. 37.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
38. 38.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
39. 39.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
40. 40.True or false: a wet tiled floor gives more friction. (a) False (b) True

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