Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 896 · 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: a grippy rubber sole? (a) more friction (b) less friction
2. 2.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
6. 6.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a box pushed on carpet (d) a wet tiled floor
8. 8.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a wet tiled floor (d) a grippy rubber sole
10. 10.True or false: a smooth steel slide gives less friction. (a) True (b) False
11. 11.True or false: a rough doormat gives more friction. (a) True (b) False
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) oil on a squeaky hinge (d) a tyre with deep treads
16. 16.True or false: a wet tiled floor gives less friction. (a) False (b) True
17. 17.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
21. 21.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
23. 23.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a wheel on ball bearings (d) oil on a squeaky hinge
25. 25.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
26. 26.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
27. 27.True or false: powder on a carrom board gives less friction. (a) False (b) True
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. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 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 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) skating on ice (d) a grippy rubber sole
33. 33.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
36. 36.🛞 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. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
38. 38.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?

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