Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 990 · 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: a grippy rubber sole gives less friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
4. 4.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) sand on a slippery path (d) a wheel on ball bearings
5. 5.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
6. 6.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a smooth steel slide (d) a wheel on ball bearings
13. 13.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
14. 14.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a tyre with deep treads
15. 15.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
18. 18.🛞 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. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
20. 20.True or false: chalk on a gym bar gives less friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
23. 23.🛞 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 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
25. 25.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
26. 26.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 11 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a box pushed on carpet
30. 30.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
31. 31.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
32. 32.True or false: skating on ice gives more friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
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 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wet tiled floor
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
38. 38.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
39. 39.True or false: a wet tiled floor gives more friction. (a) True (b) False
40. 40.True or false: powder on a carrom board gives more friction. (a) True (b) False

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