Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 101 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
4. 4.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a grippy rubber sole (d) oil on a squeaky hinge
5. 5.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
6. 6.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
8. 8.True or false: skating on ice gives more friction. (a) True (b) False
9. 9.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wet tiled floor (d) a box pushed on carpet
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
12. 12.True or false: sand on a slippery path gives less friction. (a) True (b) False
13. 13.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
15. 15.True or false: powder on a carrom board gives less friction. (a) False (b) True
16. 16.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
17. 17.🛞 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) a carpet (c) ice (d) sandpaper
18. 18.🛞 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 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.True or false: a smooth steel slide gives more friction. (a) False (b) True
21. 21.True or false: a grippy rubber sole gives more friction. (a) True (b) False
22. 22.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a box pushed on carpet (d) a tyre with deep treads
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
27. 27.True or false: chalk on a gym bar gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 9 N, a carpet 10 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 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?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
32. 32.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
33. 33.True or false: a grippy rubber sole gives less friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) a wheel on ball bearings
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
36. 36.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a tyre with deep treads (d) oil on a squeaky hinge
40. 40.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction

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