Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 108 · 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.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) powder on a carrom board (d) oil on a squeaky hinge
3. 3.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
4. 4.True or false: a grippy rubber sole gives less friction. (a) False (b) True
5. 5.True or false: chalk on a gym bar gives more friction. (a) True (b) False
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) a box pushed on carpet
11. 11.True or false: a box pushed on carpet gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a tyre with deep treads (d) a rough doormat
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
15. 15.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
17. 17.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
19. 19.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
20. 20.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
21. 21.True or false: skating on ice gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
23. 23.🛞 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 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
25. 25.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
28. 28.True or false: sand on a slippery path gives more friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 5 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a wet tiled floor (d) skating on ice
32. 32.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.True or false: a rough doormat gives more friction. (a) False (b) True
36. 36.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a box pushed on carpet (d) oil on a squeaky hinge
38. 38.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
39. 39.🛞 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 12 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
40. 40.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful

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