Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 699 · 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) less friction (b) more friction
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a rough doormat (d) a wet tiled floor
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) sand on a slippery path (d) a smooth steel slide
4. 4.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) a wheel on ball bearings (d) powder on a carrom board
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a box pushed on carpet
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
13. 13.True or false: a smooth steel slide gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
17. 17.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
21. 21.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
22. 22.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
23. 23.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
24. 24.True or false: a box pushed on carpet gives less friction. (a) True (b) False
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a smooth steel slide (d) a grippy rubber sole
27. 27.🛞 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 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
28. 28.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
30. 30.🛞 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 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) skating on ice (d) powder on a carrom board
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
33. 33.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
34. 34.True or false: a box pushed on carpet gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
37. 37.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) chalk on a gym bar (d) a wheel on ball bearings
38. 38.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
39. 39.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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