Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 719 · 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: powder on a carrom board gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
3. 3.🛞 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 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
4. 4.True or false: a rough doormat gives less friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
9. 9.True or false: sand on a slippery path gives less friction. (a) False (b) True
10. 10.True or false: a rough doormat gives more friction. (a) True (b) False
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
14. 14.True or false: skating on ice gives more friction. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) sand on a slippery path (d) chalk on a gym bar
16. 16.🛞 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 wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 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, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
20. 20.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
21. 21.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a wheel on ball bearings (d) a wet tiled floor
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
24. 24.True or false: a tyre with deep treads gives more friction. (a) True (b) False
25. 25.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
26. 26.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
27. 27.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
31. 31.🛞 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 6 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 10 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
33. 33.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) chalk on a gym bar (d) a box pushed on carpet
34. 34.🛞 More or less friction: a smooth steel slide? (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 3 N, a carpet 4 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
37. 37.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
38. 38.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a tyre with deep treads
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide

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