Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 132 · 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.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
2. 2.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
3. 3.True or false: skating on ice gives less friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
6. 6.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
8. 8.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 2 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: chalk on a gym bar gives more friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
13. 13.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a wet tiled floor (d) a tyre with deep treads
16. 16.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
17. 17.🛞 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, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
19. 19.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
21. 21.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
22. 22.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
23. 23.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) chalk on a gym bar (d) a wet tiled floor
24. 24.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wet tiled floor (d) oil on a squeaky hinge
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a rough doormat (d) a box pushed on carpet
27. 27.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) a rough doormat (d) a grippy rubber sole
28. 28.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a box pushed on carpet (d) oil on a squeaky hinge
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a smooth steel slide (d) powder on a carrom board
30. 30.True or false: a wet tiled floor gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
32. 32.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.True or false: a rough doormat gives less friction. (a) True (b) False
35. 35.True or false: a tyre with deep treads gives less friction. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a wheel on ball bearings (d) oil on a squeaky hinge
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) sand on a slippery path (d) a grippy rubber sole
39. 39.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice

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