Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 972 · 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: a tyre with deep treads gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
5. 5.True or false: a grippy rubber sole gives more friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a wet tiled floor (d) sand on a slippery path
10. 10.True or false: a rough doormat gives more friction. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
12. 12.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
15. 15.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a box pushed on carpet
16. 16.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
17. 17.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
20. 20.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a wheel on ball bearings (d) powder on a carrom board
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
24. 24.🛞 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, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
25. 25.True or false: chalk on a gym bar gives more friction. (a) False (b) True
26. 26.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
29. 29.True or false: a smooth steel slide gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
31. 31.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
33. 33.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
34. 34.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
35. 35.True or false: sand on a slippery path gives more friction. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wet tiled floor (d) a grippy rubber sole
37. 37.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
39. 39.True or false: a wet tiled floor gives more friction. (a) False (b) True
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful

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