Engineering Worksheet: Friction

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

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