Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 346 · 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.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
2. 2.True or false: a rough doormat gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a grippy rubber sole (d) a smooth steel slide
4. 4.True or false: a tyre with deep treads gives more friction. (a) False (b) True
5. 5.True or false: a grippy rubber sole gives more friction. (a) False (b) True
6. 6.True or false: a smooth steel slide gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 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 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
9. 9.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a box pushed on carpet (d) a smooth steel slide
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
14. 14.True or false: a box pushed on carpet gives less friction. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a grippy rubber sole (d) oil on a squeaky hinge
16. 16.True or false: skating on ice gives more friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) oil on a squeaky hinge (d) a wheel on ball bearings
18. 18.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) sand on a slippery path (d) a wheel on ball bearings
19. 19.True or false: sand on a slippery path gives less friction. (a) False (b) True
20. 20.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
22. 22.True or false: a tyre with deep treads gives less friction. (a) True (b) False
23. 23.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
24. 24.True or false: a grippy rubber sole gives less friction. (a) True (b) False
25. 25.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
27. 27.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
29. 29.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) powder on a carrom board
30. 30.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
31. 31.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a wheel on ball bearings (d) a smooth steel slide
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a box pushed on carpet (d) oil on a squeaky hinge
35. 35.🛞 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 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
37. 37.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a grippy rubber sole (d) a rough doormat

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