Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 964 · 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 rough doormat gives more friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a wheel on ball bearings (d) a tyre with deep treads
4. 4.🛞 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 9 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
6. 6.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
7. 7.🛞 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 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (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 11 N, ice 1 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a wet tiled floor (d) chalk on a gym bar
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
13. 13.True or false: a tyre with deep treads gives more friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.True or false: a wet tiled floor gives more friction. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a wheel on ball bearings (d) a smooth steel slide
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
19. 19.🛞 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 wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) sand on a slippery path (d) a wet tiled floor
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
22. 22.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a smooth steel slide (d) chalk on a gym bar
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.🛞 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 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) oil on a squeaky hinge
26. 26.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
30. 30.🛞 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 9 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
31. 31.🛞 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, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
32. 32.True or false: sand on a slippery path gives more friction. (a) True (b) False
33. 33.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
34. 34.True or false: chalk on a gym bar gives less friction. (a) False (b) True
35. 35.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) a wet tiled floor
37. 37.True or false: a tyre with deep treads gives less friction. (a) True (b) False
38. 38.True or false: a box pushed on carpet gives less friction. (a) True (b) False
39. 39.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem

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