Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 476 · 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.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a rough doormat (d) a tyre with deep treads
3. 3.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
4. 4.True or false: a box pushed on carpet gives more friction. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a box pushed on carpet (d) a wheel on ball bearings
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
7. 7.🛞 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 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) chalk on a gym bar (d) a tyre with deep treads
10. 10.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
11. 11.True or false: skating on ice gives less friction. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
13. 13.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
16. 16.True or false: a smooth steel slide gives more friction. (a) True (b) False
17. 17.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
18. 18.True or false: a wet tiled floor gives more friction. (a) False (b) True
19. 19.True or false: a rough doormat gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
21. 21.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
22. 22.🛞 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 10 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
23. 23.True or false: sand on a slippery path gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) powder on a carrom board (d) a box pushed on carpet
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
28. 28.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
29. 29.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
30. 30.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
34. 34.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
35. 35.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
36. 36.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
37. 37.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) oil on a squeaky hinge (d) chalk on a gym bar
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
40. 40.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice

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