Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 615 · 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.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a tyre with deep treads (d) a wet tiled floor
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
4. 4.True or false: sand on a slippery path gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
7. 7.🛞 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 wooden plank 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
10. 10.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
11. 11.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
12. 12.True or false: a smooth steel slide gives less friction. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) skating on ice (d) chalk on a gym bar
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 15 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
15. 15.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
17. 17.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) sand on a slippery path (d) powder on a carrom board
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
23. 23.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
25. 25.True or false: a box pushed on carpet gives more friction. (a) True (b) False
26. 26.True or false: a grippy rubber sole gives less friction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.True or false: a grippy rubber sole gives more friction. (a) True (b) False
30. 30.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 11 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
33. 33.True or false: a tyre with deep treads gives less friction. (a) True (b) False
34. 34.True or false: a rough doormat gives more friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
36. 36.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 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, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper

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