Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 91 · 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: skating on ice gives less friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
3. 3.True or false: a grippy rubber sole gives more friction. (a) True (b) False
4. 4.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
5. 5.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
6. 6.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a wheel on ball bearings (d) a tyre with deep treads
7. 7.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) sand on a slippery path (d) oil on a squeaky hinge
8. 8.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
10. 10.True or false: a rough doormat 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 4 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
12. 12.True or false: a tyre with deep treads gives more friction. (a) False (b) True
13. 13.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
14. 14.True or false: sand on a slippery path gives less friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 12 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
17. 17.🛞 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, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
18. 18.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
21. 21.🛞 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 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
22. 22.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a wet tiled floor (d) a tyre with deep treads
27. 27.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
35. 35.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
37. 37.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
38. 38.🛞 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 wooden plank 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
40. 40.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion

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