Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 78 · 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.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 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 9 N, a carpet 13 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
8. 8.True or false: sand on a slippery path gives less friction. (a) True (b) False
9. 9.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) oil on a squeaky hinge (d) sand on a slippery path
11. 11.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 4 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
14. 14.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
16. 16.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
17. 17.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a rough doormat (d) a smooth steel slide
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
20. 20.🛞 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 6 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
22. 22.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
23. 23.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
24. 24.True or false: powder on a carrom board gives more friction. (a) False (b) True
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
26. 26.🛞 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 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
27. 27.True or false: a tyre with deep treads gives more friction. (a) False (b) True
28. 28.🛞 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 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a smooth steel slide (d) oil on a squeaky hinge
32. 32.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) sand on a slippery path (d) a box pushed on carpet
35. 35.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
36. 36.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
37. 37.True or false: a grippy rubber sole gives less friction. (a) True (b) False
38. 38.True or false: chalk on a gym bar gives less friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) oil on a squeaky hinge (d) skating on ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper

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