Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 922 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
2. 2.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) skating on ice (d) chalk on a gym bar
5. 5.True or false: a grippy rubber sole gives less friction. (a) True (b) False
6. 6.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
7. 7.True or false: sand on a slippery path gives less friction. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a box pushed on carpet (d) sand on a slippery path
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
10. 10.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a smooth steel slide (d) chalk on a gym bar
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a wheel on ball bearings (d) a tyre with deep treads
19. 19.True or false: skating on ice gives less friction. (a) False (b) True
20. 20.True or false: a box pushed on carpet gives less friction. (a) True (b) False
21. 21.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
22. 22.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
23. 23.True or false: a smooth steel slide gives more friction. (a) False (b) True
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
26. 26.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 13 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
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 14 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
34. 34.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
35. 35.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
36. 36.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
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 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a grippy rubber sole (d) skating on ice
40. 40.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet

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