Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 38 · 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.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
7. 7.🛞 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 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
8. 8.True or false: chalk on a gym bar gives less friction. (a) False (b) True
9. 9.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) skating on ice (d) a box pushed on carpet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a tyre with deep treads (d) a rough doormat
16. 16.True or false: skating on ice gives more friction. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a wet tiled floor (d) a tyre with deep treads
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
21. 21.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a wet tiled floor (d) skating on ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
23. 23.True or false: a wet tiled floor gives less friction. (a) False (b) True
24. 24.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 13 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: sand on a slippery path gives more friction. (a) True (b) False
27. 27.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) chalk on a gym bar (d) oil on a squeaky hinge
29. 29.True or false: sand on a slippery path gives less friction. (a) True (b) False
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
32. 32.True or false: a tyre with deep treads gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) chalk on a gym bar (d) oil on a squeaky hinge
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
35. 35.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a wet tiled floor
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
38. 38.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) a tyre with deep treads (d) sand on a slippery path
39. 39.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful

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