Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 762 · 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.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a tyre with deep treads (d) a grippy rubber sole
2. 2.True or false: a smooth steel slide gives more friction. (a) True (b) False
3. 3.🛞 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 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
4. 4.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
5. 5.True or false: oil on a squeaky hinge 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: ice 4 N, a glass sheet 8 N, a wooden plank 12 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 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 wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
9. 9.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
11. 11.True or false: sand on a slippery path gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
15. 15.True or false: a smooth steel slide gives less friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wet tiled floor
19. 19.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) sand on a slippery path (d) a tyre with deep treads
20. 20.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wheel on ball bearings (d) a grippy rubber sole
23. 23.🛞 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, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
24. 24.True or false: a rough doormat gives less friction. (a) False (b) True
25. 25.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
26. 26.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a box pushed on carpet (d) a grippy rubber sole
28. 28.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
29. 29.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
30. 30.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
31. 31.True or false: sand on a slippery path gives less friction. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a rough doormat (d) skating on ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
34. 34.🛞 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 8 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
35. 35.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
37. 37.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
38. 38.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
39. 39.True or false: a grippy rubber sole gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet

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