Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 974 · 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 rough doormat gives less friction. (a) True (b) False
2. 2.True or false: a box pushed on carpet gives more friction. (a) True (b) False
3. 3.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) oil on a squeaky hinge
7. 7.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) sand on a slippery path (d) skating on ice
9. 9.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a tyre with deep treads (d) oil on a squeaky hinge
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
13. 13.🛞 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. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
15. 15.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) oil on a squeaky hinge (d) a wheel on ball bearings
17. 17.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
18. 18.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
20. 20.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
21. 21.True or false: sand on a slippery path gives more friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) oil on a squeaky hinge (d) skating on ice
23. 23.True or false: a tyre with deep treads gives less friction. (a) True (b) False
24. 24.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
25. 25.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
27. 27.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
32. 32.🛞 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 6 N, a carpet 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
34. 34.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
36. 36.True or false: a smooth steel slide gives less friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
39. 39.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet

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