Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 935 · 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.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
2. 2.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
3. 3.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wheel on ball bearings
6. 6.True or false: a tyre with deep treads gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 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) ice (b) sandpaper (c) a carpet (d) a glass sheet
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
16. 16.🛞 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 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
17. 17.True or false: a grippy rubber sole gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
20. 20.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
22. 22.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
23. 23.True or false: a smooth steel slide gives less friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) skating on ice (d) sand on a slippery path
25. 25.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
27. 27.True or false: a rough doormat gives less friction. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) skating on ice (d) powder on a carrom board
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
30. 30.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
31. 31.True or false: a box pushed on carpet gives less friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a rough doormat (d) a tyre with deep treads
35. 35.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 14 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
39. 39.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a tyre with deep treads (d) oil on a squeaky hinge
40. 40.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction

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