Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 792 · 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: a tyre with deep treads gives less friction. (a) False (b) True
2. 2.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
3. 3.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
4. 4.True or false: a wet tiled floor gives more friction. (a) True (b) False
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) powder on a carrom board (d) a wet tiled floor
11. 11.🛞 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 10 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) powder on a carrom board (d) a grippy rubber sole
13. 13.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.True or false: sand on a slippery path gives more friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
17. 17.True or false: a grippy rubber sole gives less friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) chalk on a gym bar (d) oil on a squeaky hinge
19. 19.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a tyre with deep treads
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
21. 21.True or false: a smooth steel slide gives less friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
27. 27.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
28. 28.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
29. 29.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
33. 33.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a rough doormat (d) oil on a squeaky hinge
35. 35.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
36. 36.🛞 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. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
38. 38.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
40. 40.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful

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