Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 370 · 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 smooth steel slide gives more friction. (a) True (b) False
2. 2.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
3. 3.True or false: a box pushed on carpet gives less friction. (a) True (b) False
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
5. 5.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
6. 6.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
13. 13.True or false: a smooth steel slide gives less friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
17. 17.🛞 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, sandpaper 12 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.True or false: a rough doormat gives more friction. (a) True (b) False
19. 19.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
20. 20.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.True or false: a grippy rubber sole gives less friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
24. 24.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
25. 25.🛞 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 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
29. 29.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wet tiled floor (d) a tyre with deep treads
30. 30.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a rough doormat (d) chalk on a gym bar
32. 32.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a rough doormat (d) a wet tiled floor
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
35. 35.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wet tiled floor
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wet tiled floor

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