Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 271 · 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: writing with a pencil? (a) helpful (b) a problem
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
3. 3.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
4. 4.True or false: skating on ice gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a tyre with deep treads (d) a grippy rubber sole
9. 9.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a rough doormat (d) a wheel on ball bearings
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
13. 13.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) powder on a carrom board (d) a wheel on ball bearings
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) oil on a squeaky hinge
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
21. 21.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
22. 22.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
23. 23.True or false: sand on a slippery path gives less friction. (a) False (b) True
24. 24.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
26. 26.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
27. 27.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
29. 29.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
30. 30.True or false: a grippy rubber sole gives less friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
33. 33.True or false: a tyre with deep treads gives less friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) chalk on a gym bar (d) a wheel on ball bearings
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
38. 38.True or false: powder on a carrom board gives less friction. (a) True (b) False
39. 39.🛞 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 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet

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