Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 578 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
3. 3.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
6. 6.True or false: a wet tiled floor gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
8. 8.True or false: a wet tiled floor gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a smooth steel slide (d) oil on a squeaky hinge
11. 11.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a grippy rubber sole (d) sand on a slippery path
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) powder on a carrom board (d) chalk on a gym bar
17. 17.🛞 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 9 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
19. 19.True or false: skating on ice gives more friction. (a) False (b) True
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a wet tiled floor (d) skating on ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) a tyre with deep treads (d) a grippy rubber sole
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
25. 25.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
26. 26.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
27. 27.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a wet tiled floor (d) sand on a slippery path
28. 28.True or false: powder on a carrom board gives more friction. (a) True (b) False
29. 29.True or false: a tyre with deep treads gives less friction. (a) False (b) True
30. 30.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
31. 31.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
34. 34.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
39. 39.True or false: a rough doormat gives more friction. (a) False (b) True
40. 40.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True

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