Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 887 · 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) more friction (b) less friction
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
5. 5.True or false: a rough doormat gives more friction. (a) True (b) False
6. 6.True or false: a box pushed on carpet gives less friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a smooth steel slide (d) oil on a squeaky hinge
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.True or false: chalk on a gym bar gives less friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a rough doormat (d) oil on a squeaky hinge
11. 11.🛞 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 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
12. 12.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
16. 16.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
17. 17.True or false: powder on a carrom board gives more friction. (a) True (b) False
18. 18.True or false: skating on ice gives more friction. (a) True (b) False
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
21. 21.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) powder on a carrom board
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a grippy rubber sole (d) a box pushed on carpet
26. 26.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
28. 28.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.True or false: a grippy rubber sole gives less friction. (a) True (b) False
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
33. 33.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
34. 34.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) skating on ice
36. 36.True or false: a wet tiled floor gives less friction. (a) True (b) False
37. 37.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
38. 38.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
40. 40.True or false: sand on a slippery path gives less friction. (a) True (b) False

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