Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 930 · 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: sand on a slippery path? (a) less friction (b) more friction
2. 2.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
3. 3.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
4. 4.🛞 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 11 N, sandpaper 14 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
5. 5.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
12. 12.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a grippy rubber sole (d) oil on a squeaky hinge
13. 13.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a tyre with deep treads (d) a smooth steel slide
14. 14.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) chalk on a gym bar (d) a grippy rubber sole
15. 15.True or false: a box pushed on carpet gives less friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
17. 17.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 11 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) a wet tiled floor
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a smooth steel slide (d) oil on a squeaky hinge
26. 26.True or false: chalk on a gym bar gives more friction. (a) False (b) True
27. 27.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a grippy rubber sole (d) chalk on a gym bar
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a grippy rubber sole (d) skating on ice
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
35. 35.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
36. 36.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
37. 37.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
39. 39.🛞 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 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
40. 40.🛞 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 5 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?

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