Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 538 · 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.True or false: chalk on a gym bar gives less friction. (a) True (b) False
2. 2.🛞 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 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
3. 3.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) powder on a carrom board (d) a wheel on ball bearings
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) oil on a squeaky hinge (d) a grippy rubber sole
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
8. 8.True or false: a wet tiled floor gives more friction. (a) True (b) False
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
10. 10.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a rough doormat
12. 12.True or false: a wet tiled floor gives less friction. (a) True (b) False
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a wheel on ball bearings (d) a box pushed on carpet
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wet tiled floor (d) a rough doormat
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
17. 17.🛞 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 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
20. 20.True or false: a smooth steel slide gives more friction. (a) False (b) True
21. 21.True or false: skating on ice gives more friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
27. 27.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
29. 29.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
30. 30.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
34. 34.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a tyre with deep treads (d) a smooth steel slide
37. 37.🛞 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 11 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
38. 38.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
40. 40.True or false: sand on a slippery path gives less friction. (a) False (b) True

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