Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 186 · 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: chalk on a gym bar gives less friction. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a wheel on ball bearings
3. 3.True or false: a rough doormat gives less friction. (a) True (b) False
4. 4.True or false: chalk on a gym bar gives more friction. (a) True (b) False
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
6. 6.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
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 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
8. 8.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) a rough doormat (d) a grippy rubber sole
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 11 N, a carpet 13 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
12. 12.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
13. 13.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) powder on a carrom board (d) a rough doormat
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a box pushed on carpet (d) chalk on a gym bar
17. 17.True or false: a smooth steel slide gives less friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a tyre with deep treads
19. 19.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
20. 20.True or false: a wet tiled floor 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 carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
23. 23.True or false: a grippy rubber sole gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) chalk on a gym bar (d) a wheel on ball bearings
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
28. 28.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
29. 29.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
30. 30.True or false: skating on ice gives less friction. (a) True (b) False
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
34. 34.🛞 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 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
35. 35.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
37. 37.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 More or less friction: skating on ice? (a) less friction (b) more friction

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