Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 993 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
2. 2.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
3. 3.🛞 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 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
4. 4.True or false: a rough doormat gives more friction. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) skating on ice (d) chalk on a gym bar
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) oil on a squeaky hinge (d) skating on ice
9. 9.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
12. 12.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a smooth steel slide (d) skating on ice
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a grippy rubber sole (d) a wheel on ball bearings
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a box pushed on carpet (d) a tyre with deep treads
17. 17.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
18. 18.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
19. 19.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
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, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
22. 22.True or false: a wet tiled floor gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
27. 27.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a box pushed on carpet
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) powder on a carrom board (d) chalk on a gym bar
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
30. 30.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
32. 32.True or false: sand on a slippery path gives more friction. (a) True (b) False
33. 33.True or false: sand on a slippery path gives less friction. (a) False (b) True
34. 34.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
35. 35.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) sand on a slippery path (d) a smooth steel slide
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
37. 37.🛞 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 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
39. 39.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm

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