Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 486 · 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.True or false: powder on a carrom board gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
5. 5.True or false: a grippy rubber sole gives less friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) sand on a slippery path (d) a box pushed on carpet
9. 9.True or false: a rough doormat gives less friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
13. 13.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a box pushed on carpet (d) a grippy rubber sole
15. 15.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
16. 16.True or false: a smooth steel slide gives less friction. (a) False (b) True
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
18. 18.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a wheel on ball bearings (d) a rough doormat
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 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 wet tiled floor
25. 25.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
26. 26.True or false: chalk on a gym bar gives more friction. (a) True (b) False
27. 27.True or false: sand on a slippery path gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
29. 29.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
30. 30.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
31. 31.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 11 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 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 carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 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. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) oil on a squeaky hinge (d) a wet tiled floor
38. 38.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a wet tiled floor (d) a grippy rubber sole
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a tyre with deep treads (d) a grippy rubber sole

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