Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 663 · 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 smooth steel slide? (a) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 15 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
6. 6.True or false: a wet tiled floor gives more friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) sand on a slippery path (d) a tyre with deep treads
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
9. 9.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a rough doormat (d) skating on ice
13. 13.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
15. 15.True or false: a tyre with deep treads gives more friction. (a) True (b) False
16. 16.🛞 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 wooden plank 10 N, a carpet 12 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
17. 17.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a box pushed on carpet (d) sand on a slippery path
21. 21.True or false: sand on a slippery path gives less friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a smooth steel slide (d) a wet tiled floor
23. 23.🛞 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 7 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
24. 24.True or false: a grippy rubber sole gives less friction. (a) True (b) False
25. 25.True or false: a rough doormat gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
28. 28.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
31. 31.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
32. 32.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a rough doormat
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
34. 34.🛞 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 15 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
37. 37.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
38. 38.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
39. 39.True or false: a wet tiled floor gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?

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