Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 771 · 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: writing with a pencil? (a) helpful (b) a problem
2. 2.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a box pushed on carpet (d) sand on a slippery path
4. 4.True or false: a wet tiled floor gives less friction. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
6. 6.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) powder on a carrom board (d) a smooth steel slide
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
8. 8.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
9. 9.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) powder on a carrom board (d) a tyre with deep treads
10. 10.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
13. 13.True or false: powder on a carrom board gives less friction. (a) True (b) False
14. 14.True or false: sand on a slippery path 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: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) chalk on a gym bar (d) sand on a slippery path
18. 18.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
19. 19.True or false: chalk on a gym bar gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) a wheel on ball bearings
22. 22.True or false: a rough doormat gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
25. 25.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
26. 26.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a smooth steel slide (d) sand on a slippery path
29. 29.🛞 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 5 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
34. 34.True or false: a tyre with deep treads gives less friction. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a rough doormat (d) a smooth steel slide
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) chalk on a gym bar (d) sand on a slippery path
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 14 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
40. 40.True or false: a wheel on ball bearings gives more friction. (a) True (b) False

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