Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 669 · 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: oil on a squeaky hinge gives more friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
3. 3.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
4. 4.True or false: chalk on a gym bar gives less friction. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) oil on a squeaky hinge (d) a tyre with deep treads
6. 6.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.True or false: a box pushed on carpet gives more friction. (a) False (b) True
9. 9.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
10. 10.🛞 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 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) a wet tiled floor
13. 13.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
14. 14.True or false: a rough doormat gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
17. 17.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
18. 18.True or false: a wet tiled floor gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) chalk on a gym bar
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a wheel on ball bearings (d) a grippy rubber sole
28. 28.True or false: a wet tiled floor gives more friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on 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 8 N, a carpet 11 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) sand on a slippery path (d) a box pushed on carpet
33. 33.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
36. 36.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
37. 37.True or false: a rough doormat gives less friction. (a) False (b) True
38. 38.True or false: a smooth steel slide gives more friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a smooth steel slide (d) a box pushed on carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?

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