Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 557 · 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.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a box pushed on carpet (d) a wheel on ball bearings
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a box pushed on carpet (d) a grippy rubber sole
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
4. 4.True or false: a rough doormat gives less friction. (a) True (b) False
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 rough doormat (b) oil on a squeaky hinge (c) sand on a slippery path (d) chalk on a gym bar
7. 7.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a smooth steel slide (d) skating on ice
11. 11.True or false: a grippy rubber sole gives more friction. (a) False (b) True
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
15. 15.True or false: chalk on a gym bar gives less friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) skating on ice (d) a smooth steel slide
17. 17.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
18. 18.🛞 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?
19. 19.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
20. 20.True or false: a tyre with deep treads gives more friction. (a) True (b) False
21. 21.True or false: sand on a slippery path gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 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) a wooden plank (c) ice (d) a carpet
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) sand on a slippery path (d) skating on ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
29. 29.True or false: sand on a slippery path gives less friction. (a) False (b) True
30. 30.True or false: a rough doormat gives more friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
32. 32.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
33. 33.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
34. 34.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
35. 35.True or false: a grippy rubber sole gives less friction. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
38. 38.True or false: a box pushed on carpet gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) skating on ice (d) a rough doormat

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