Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 614 · 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.True or false: a wet tiled floor gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
4. 4.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
5. 5.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
6. 6.🛞 More or less friction: a wheel on ball bearings? (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 7 N, a wooden plank 11 N, a carpet 13 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
8. 8.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a rough doormat (d) a wheel on ball bearings
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a smooth steel slide (d) powder on a carrom board
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
14. 14.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
15. 15.True or false: a rough doormat gives more friction. (a) True (b) False
16. 16.True or false: a smooth steel slide gives more friction. (a) False (b) True
17. 17.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) sand on a slippery path
19. 19.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
20. 20.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) skating on ice (d) a grippy rubber sole
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
26. 26.True or false: sand on a slippery path gives more friction. (a) False (b) True
27. 27.True or false: sand on a slippery path gives less friction. (a) False (b) True
28. 28.🛞 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, sandpaper 8 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 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 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) oil on a squeaky hinge (d) sand on a slippery path
31. 31.🛞 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 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
32. 32.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
38. 38.🛞 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 wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank

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