Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 739 · 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: brakes stopping a cycle? (a) a problem (b) helpful
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.True or false: sand on a slippery path gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
9. 9.🛞 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 carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a smooth steel slide (d) chalk on a gym bar
11. 11.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
12. 12.🛞 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 11 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wheel on ball bearings (d) a grippy rubber sole
14. 14.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
15. 15.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
19. 19.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
20. 20.True or false: a grippy rubber sole gives less friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
22. 22.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
23. 23.🛞 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, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
27. 27.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a box pushed on carpet (d) chalk on a gym bar
28. 28.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a wet tiled floor (d) a box pushed on carpet
29. 29.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
30. 30.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
31. 31.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
33. 33.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a box pushed on carpet (d) a tyre with deep treads
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
36. 36.True or false: a grippy rubber sole gives more friction. (a) True (b) False
37. 37.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
40. 40.🛞 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 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?

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