Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 205 · 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: a rough doormat 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 glass sheet 4 N, a wooden plank 7 N, sandpaper 11 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
5. 5.True or false: chalk on a gym bar gives less friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
11. 11.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
12. 12.True or false: a box pushed on carpet gives more friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a rough doormat (d) oil on a squeaky hinge
14. 14.🛞 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 4 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
16. 16.🔍 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 wheel on ball bearings
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) sand on a slippery path (d) a wet tiled floor
19. 19.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
20. 20.True or false: a tyre with deep treads gives less friction. (a) True (b) False
21. 21.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) oil on a squeaky hinge (d) a wet tiled floor
25. 25.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
26. 26.True or false: skating on ice gives less friction. (a) True (b) False
27. 27.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
28. 28.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
33. 33.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
34. 34.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) sand on a slippery path (d) a wheel on ball bearings
35. 35.🛞 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 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
38. 38.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction

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