Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 123 · 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.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
2. 2.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
3. 3.True or false: a grippy rubber sole gives less friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
6. 6.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) a wet tiled floor (d) a wheel on ball bearings
10. 10.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
11. 11.🛞 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, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
12. 12.True or false: a box pushed on carpet gives less friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
16. 16.True or false: a tyre with deep treads gives less friction. (a) True (b) False
17. 17.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a box pushed on carpet (d) a smooth steel slide
19. 19.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) skating on ice (d) a wheel on ball bearings
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a tyre with deep treads (d) powder on a carrom board
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
26. 26.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
27. 27.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
28. 28.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a box pushed on carpet (d) a tyre with deep treads
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) sand on a slippery path (d) a wet tiled floor
34. 34.🛞 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 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
36. 36.True or false: a wet tiled floor gives more friction. (a) True (b) False
37. 37.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
38. 38.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
39. 39.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
40. 40.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction

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