Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 743 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
2. 2.True or false: a smooth steel slide gives more friction. (a) False (b) True
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
4. 4.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 6 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
7. 7.True or false: a smooth steel slide gives less friction. (a) False (b) True
8. 8.True or false: a grippy rubber sole gives less friction. (a) False (b) True
9. 9.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
10. 10.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
12. 12.True or false: a box pushed on carpet gives more friction. (a) False (b) True
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
14. 14.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.True or false: skating on ice gives more 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
18. 18.True or false: a box pushed on carpet gives less friction. (a) False (b) True
19. 19.True or false: a wet tiled floor gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
25. 25.True or false: chalk on a gym bar gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
27. 27.True or false: a wet tiled floor gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
31. 31.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
32. 32.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) skating on ice (d) powder on a carrom board
33. 33.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
35. 35.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
36. 36.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a wheel on ball bearings (d) powder on a carrom board
37. 37.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem

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