Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 833 · 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: chalk on a gym bar? (a) more friction (b) less friction
2. 2.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
4. 4.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
6. 6.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
7. 7.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a smooth steel slide (d) a wheel on ball bearings
8. 8.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
11. 11.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
12. 12.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a box pushed on carpet (d) oil on a squeaky hinge
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) chalk on a gym bar (d) a wheel on ball bearings
21. 21.True or false: a wet tiled floor gives less friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 2 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wet tiled floor (d) a smooth steel slide
26. 26.🛞 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 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
28. 28.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
33. 33.True or false: skating on ice gives more friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) chalk on a gym bar (d) powder on a carrom board
35. 35.True or false: chalk on a gym bar gives more friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a smooth steel slide (d) a box pushed on carpet
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
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 carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful

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