Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 207 · 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 grippy rubber sole gives less friction. (a) False (b) True
2. 2.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a box pushed on carpet (d) a wheel on ball bearings
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
5. 5.True or false: chalk on a gym bar gives less friction. (a) True (b) False
6. 6.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
7. 7.True or false: sand on a slippery path gives less friction. (a) True (b) False
8. 8.🛞 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 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
10. 10.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
11. 11.True or false: a grippy rubber sole gives more friction. (a) True (b) False
12. 12.True or false: sand on a slippery path gives more friction. (a) False (b) True
13. 13.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
14. 14.True or false: a box pushed on carpet gives more friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
18. 18.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a grippy rubber sole (d) sand on a slippery path
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
24. 24.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
25. 25.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
26. 26.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a box pushed on carpet (d) a tyre with deep treads
28. 28.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a smooth steel slide (d) a wheel on ball bearings
29. 29.🛞 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 carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.True or false: powder on a carrom board gives more friction. (a) False (b) True
32. 32.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) sand on a slippery path (d) powder on a carrom board
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
36. 36.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 11 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
39. 39.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem

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