Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 129 · 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: a carpet 12 N, sandpaper 13 N, ice 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a smooth steel slide (d) a tyre with deep treads
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 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 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
6. 6.🛞 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 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
7. 7.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 7 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 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 carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 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 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) skating on ice (d) chalk on a gym bar
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a grippy rubber sole (d) a tyre with deep treads
14. 14.True or false: powder on a carrom board gives less friction. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a rough doormat (d) a box pushed on carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 14 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
25. 25.True or false: chalk on a gym bar gives less friction. (a) True (b) False
26. 26.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) chalk on a gym bar
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a tyre with deep treads (d) a smooth steel slide
30. 30.🛞 More or less friction: a box pushed on carpet? (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 glass sheet 4 N, a carpet 5 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
32. 32.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
33. 33.True or false: a wet tiled floor gives less friction. (a) False (b) True
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
36. 36.True or false: a grippy rubber sole gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 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: ice 3 N, a glass sheet 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a tyre with deep treads (d) a grippy rubber sole
40. 40.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand

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