Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 877 · 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: sand on a slippery path? (a) more friction (b) less friction
2. 2.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
5. 5.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
8. 8.True or false: a tyre with deep treads gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
11. 11.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
13. 13.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
14. 14.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
15. 15.🛞 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 10 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.True or false: a tyre with deep treads gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
19. 19.True or false: a smooth steel slide gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 15 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a box pushed on carpet (d) a smooth steel slide
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
24. 24.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
26. 26.True or false: a box pushed on carpet gives more friction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
30. 30.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
31. 31.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
34. 34.True or false: a grippy rubber sole gives more friction. (a) False (b) True
35. 35.True or false: a rough doormat gives more friction. (a) True (b) False
36. 36.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?

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