Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 435 · 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) helpful (b) a problem
2. 2.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
4. 4.🛞 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 carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.🛞 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, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
7. 7.True or false: a rough doormat gives more friction. (a) True (b) False
8. 8.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
9. 9.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
10. 10.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
13. 13.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
16. 16.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
17. 17.True or false: powder on a carrom board gives less friction. (a) False (b) True
18. 18.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a rough doormat (d) sand on a slippery path
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
22. 22.True or false: a rough doormat gives less friction. (a) False (b) True
23. 23.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) skating on ice (d) a tyre with deep treads
25. 25.True or false: sand on a slippery path gives more friction. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a wheel on ball bearings (d) chalk on a gym bar
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) sand on a slippery path (d) a smooth steel slide
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
30. 30.True or false: skating on ice gives more friction. (a) False (b) True
31. 31.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
32. 32.🛞 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 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a wheel on ball bearings
35. 35.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 6 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
39. 39.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) oil on a squeaky hinge (d) a rough doormat

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