Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 42 · 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 tyre with deep treads? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
5. 5.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
6. 6.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a smooth steel slide (d) a rough doormat
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) oil on a squeaky hinge (d) chalk on a gym bar
10. 10.True or false: a wet tiled floor gives less friction. (a) False (b) True
11. 11.True or false: a smooth steel slide gives less friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
14. 14.True or false: chalk on a gym bar gives more friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) oil on a squeaky hinge (d) a tyre with deep treads
17. 17.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wet tiled floor (d) a rough doormat
19. 19.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
20. 20.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.True or false: a tyre with deep treads gives more friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a tyre with deep treads (d) a grippy rubber sole
29. 29.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 8 N, a carpet 9 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.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
37. 37.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
38. 38.True or false: a grippy rubber sole gives less friction. (a) True (b) False
39. 39.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
40. 40.🛞 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 9 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet

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