Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 488 · 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.🛞 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 10 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
2. 2.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
3. 3.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
4. 4.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
5. 5.True or false: a smooth steel slide gives more friction. (a) False (b) True
6. 6.🛞 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 9 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
8. 8.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) sand on a slippery path (d) oil on a squeaky hinge
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
13. 13.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a rough doormat (d) chalk on a gym bar
15. 15.🛞 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 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
16. 16.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
17. 17.True or false: a rough doormat gives more friction. (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
19. 19.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
22. 22.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 14 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
26. 26.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
27. 27.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
28. 28.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a grippy rubber sole (d) chalk on a gym bar
29. 29.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a wet tiled floor (d) a grippy rubber sole
30. 30.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) skating on ice (d) powder on a carrom board
32. 32.True or false: skating on ice gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wet tiled floor (d) powder on a carrom board
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
35. 35.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
36. 36.True or false: a wet tiled floor gives less friction. (a) False (b) True
37. 37.True or false: a grippy rubber sole gives more friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful

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