Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 248 · 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.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) sand on a slippery path (d) a wheel on ball bearings
2. 2.True or false: a smooth steel slide gives less friction. (a) False (b) True
3. 3.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) oil on a squeaky hinge (d) sand on a slippery path
5. 5.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
8. 8.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
11. 11.🛞 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 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
14. 14.🛞 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 wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
15. 15.True or false: a tyre with deep treads gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
19. 19.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
20. 20.True or false: a tyre with deep treads gives less friction. (a) False (b) True
21. 21.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a box pushed on carpet (d) a wet tiled floor
23. 23.True or false: sand on a slippery path gives less friction. (a) True (b) False
24. 24.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
25. 25.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
26. 26.True or false: a rough doormat gives more friction. (a) True (b) False
27. 27.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
28. 28.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
31. 31.True or false: a wet tiled floor gives less friction. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a box pushed on carpet (d) a tyre with deep treads
33. 33.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
35. 35.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
36. 36.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a wet tiled floor (d) oil on a squeaky hinge
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a tyre with deep treads (d) powder on a carrom board

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