Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 162 · 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 smooth steel slide (b) oil on a squeaky hinge (c) sand on a slippery path (d) skating on ice
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a box pushed on carpet (d) skating on ice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 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 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
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: dragging a heavy box? (a) a problem (b) helpful
14. 14.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
17. 17.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
20. 20.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) powder on a carrom board (d) oil on a squeaky hinge
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 16 N, ice 4 N, a glass sheet 8 N, a carpet 12 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
26. 26.True or false: sand on a slippery path gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
28. 28.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a grippy rubber sole (d) oil on a squeaky hinge
31. 31.True or false: a tyre with deep treads gives more friction. (a) True (b) False
32. 32.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
34. 34.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 9 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
39. 39.True or false: a smooth steel slide gives less friction. (a) True (b) False
40. 40.🛞 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) ice (c) a wooden plank (d) sandpaper

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