Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 169 · 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.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a rough doormat (d) chalk on a gym bar
2. 2.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
4. 4.True or false: powder on a carrom board gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
6. 6.True or false: a grippy rubber sole gives less friction. (a) True (b) False
7. 7.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
8. 8.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 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 10 N, ice 4 N, a glass sheet 7 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
11. 11.True or false: a rough doormat gives less friction. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wheel on ball bearings (d) a box pushed on carpet
13. 13.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
14. 14.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
17. 17.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
19. 19.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
21. 21.🛞 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 carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 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 7 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
24. 24.True or false: skating on ice gives less friction. (a) False (b) True
25. 25.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
26. 26.🛞 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 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
29. 29.🛞 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, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
32. 32.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
33. 33.True or false: a wet tiled floor gives more friction. (a) True (b) False
34. 34.True or false: chalk on a gym bar gives less friction. (a) False (b) True
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
36. 36.🛞 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 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a wet tiled floor
38. 38.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a smooth steel slide (d) a rough doormat
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
40. 40.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass

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