Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 369 · 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.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
4. 4.🛞 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 11 N. How many newtons more were needed on sandpaper than on ice?
5. 5.True or false: sand on a slippery path gives less friction. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) chalk on a gym bar (d) a rough doormat
9. 9.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
10. 10.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
13. 13.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🔍 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
18. 18.🛞 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, a carpet 11 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.True or false: a rough doormat gives less friction. (a) True (b) False
20. 20.True or false: a grippy rubber sole gives more friction. (a) True (b) False
21. 21.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a tyre with deep treads (d) a box pushed on carpet
23. 23.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
24. 24.🛞 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 9 N. How many newtons more were needed on a carpet than on ice?
25. 25.True or false: a wet tiled floor gives less friction. (a) True (b) False
26. 26.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) chalk on a gym bar (d) oil on a squeaky hinge
28. 28.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a smooth steel slide
29. 29.True or false: a box pushed on carpet gives less friction. (a) False (b) True
30. 30.True or false: a tyre with deep treads gives more friction. (a) False (b) True
31. 31.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
32. 32.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
33. 33.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
36. 36.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a tyre with deep treads (d) a rough doormat
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) skating on ice (d) sand on a slippery path
40. 40.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) powder on a carrom board (d) a wheel on ball bearings

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