Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 313 · 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: skating on ice gives more friction. (a) True (b) False
2. 2.True or false: sand on a slippery path gives more friction. (a) True (b) False
3. 3.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a rough doormat (d) oil on a squeaky hinge
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
6. 6.🛞 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 11 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
7. 7.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) oil on a squeaky hinge (d) a box pushed on carpet
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a smooth steel slide (d) skating on ice
11. 11.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a grippy rubber sole (d) skating on ice
17. 17.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 14 N, ice 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) chalk on a gym bar (d) a grippy rubber sole
25. 25.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a tyre with deep treads (d) a wheel on ball bearings
27. 27.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
28. 28.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) chalk on a gym bar (d) a smooth steel slide
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
30. 30.True or false: a smooth steel slide gives more friction. (a) True (b) False
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
33. 33.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
34. 34.🛞 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 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
36. 36.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
38. 38.🛞 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, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
39. 39.True or false: a grippy rubber sole gives less friction. (a) True (b) False
40. 40.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful

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