Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 449 · 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: walking without slipping? (a) helpful (b) a problem
2. 2.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
3. 3.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
5. 5.True or false: skating on ice gives more friction. (a) False (b) True
6. 6.True or false: a box pushed on carpet gives more friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) skating on ice (d) a box pushed on carpet
8. 8.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
11. 11.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a rough doormat
13. 13.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
14. 14.True or false: a smooth steel slide gives more friction. (a) True (b) False
15. 15.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
16. 16.True or false: skating on ice gives less friction. (a) True (b) False
17. 17.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
18. 18.True or false: a wet tiled floor gives less friction. (a) False (b) True
19. 19.🛞 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 carpet 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
20. 20.True or false: sand on a slippery path gives more friction. (a) True (b) False
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
22. 22.True or false: chalk on a gym bar gives less friction. (a) False (b) True
23. 23.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
26. 26.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wheel on ball bearings (d) oil on a squeaky hinge
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
29. 29.True or false: sand on a slippery path 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: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) chalk on a gym bar (d) a wet tiled floor
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 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 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a wheel on ball bearings (d) a grippy rubber sole
36. 36.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
38. 38.🛞 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 wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
40. 40.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction

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