Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 623 · 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.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a wet tiled floor (d) a smooth steel slide
3. 3.🛞 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, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
10. 10.🛞 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 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
12. 12.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
13. 13.True or false: skating on ice gives less friction. (a) True (b) False
14. 14.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
15. 15.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) skating on ice (d) chalk on a gym bar
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
17. 17.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wheel on ball bearings (d) a grippy rubber sole
18. 18.True or false: a tyre with deep treads gives less friction. (a) True (b) False
19. 19.True or false: a wet tiled floor gives less friction. (a) True (b) False
20. 20.True or false: a rough doormat gives less friction. (a) True (b) False
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
22. 22.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
23. 23.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
24. 24.🛞 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 10 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) oil on a squeaky hinge (d) a rough doormat
26. 26.True or false: a smooth steel slide gives more friction. (a) True (b) False
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
31. 31.True or false: sand on a slippery path gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
33. 33.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a wet tiled floor (d) a smooth steel slide
34. 34.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
35. 35.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
36. 36.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) skating on ice (d) a tyre with deep treads
37. 37.True or false: a grippy rubber sole gives less friction. (a) False (b) True
38. 38.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
39. 39.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a tyre with deep treads (d) sand on a slippery path
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem

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