Engineering Worksheet: Friction

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

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