Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 727 · 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 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?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
4. 4.True or false: a rough doormat gives more friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
10. 10.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a smooth steel slide (d) a wet tiled floor
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a wet tiled floor (d) chalk on a gym bar
16. 16.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
21. 21.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a grippy rubber sole (d) a wet tiled floor
22. 22.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
23. 23.🛞 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 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
24. 24.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
25. 25.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a wheel on ball bearings (d) chalk on a gym bar
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 12 N, a carpet 16 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
30. 30.True or false: skating on ice gives less friction. (a) False (b) True
31. 31.🛞 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 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
32. 32.True or false: a wet tiled floor gives more friction. (a) False (b) True
33. 33.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
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 8 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) skating on ice (d) sand on a slippery path
37. 37.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
38. 38.🛞 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 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
40. 40.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem

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