Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 498 · 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) only on ice (b) with the motion (c) against the motion (d) only upwards
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
3. 3.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
9. 9.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) sand on a slippery path (d) skating on ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) skating on ice (d) a wet tiled floor
17. 17.True or false: sand on a slippery path gives less friction. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a wet tiled floor (d) a rough doormat
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a box pushed on carpet (d) oil on a squeaky hinge
20. 20.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
21. 21.🛞 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 2 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
25. 25.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
26. 26.True or false: powder on a carrom board gives more friction. (a) True (b) False
27. 27.True or false: a tyre with deep treads gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 11 N, a carpet 15 N. How many newtons more were needed on a carpet than on ice?
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a smooth steel slide (d) oil on a squeaky hinge
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a grippy rubber sole (d) a tyre with deep treads
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
32. 32.True or false: a box pushed on carpet gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
35. 35.🛞 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 10 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
37. 37.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper

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