Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 139 · 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: skating on ice gives less friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a box pushed on carpet (d) a rough doormat
6. 6.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a box pushed on carpet (d) oil on a squeaky hinge
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a wet tiled floor (d) a wheel on ball bearings
8. 8.True or false: a smooth steel slide gives more friction. (a) True (b) False
9. 9.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
11. 11.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a rough doormat (d) chalk on a gym bar
14. 14.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
15. 15.True or false: sand on a slippery path gives more friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
17. 17.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
19. 19.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a box pushed on carpet (d) skating on ice
25. 25.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
26. 26.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) sand on a slippery path (d) a rough doormat
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
28. 28.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
29. 29.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, a carpet 11 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
32. 32.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
34. 34.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) powder on a carrom board (d) a smooth steel slide
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 14 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
37. 37.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
38. 38.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper

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