Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 785 · 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: oil on a squeaky hinge gives less friction. (a) False (b) True
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
5. 5.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
6. 6.True or false: a tyre with deep treads gives less friction. (a) True (b) False
7. 7.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
9. 9.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
10. 10.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
11. 11.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) skating on ice (d) powder on a carrom board
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wheel on ball bearings (d) sand on a slippery path
16. 16.True or false: a box pushed on carpet gives less friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
18. 18.True or false: a grippy rubber sole gives less friction. (a) True (b) False
19. 19.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
21. 21.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
22. 22.True or false: powder on a carrom board gives more friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
24. 24.True or false: chalk on a gym bar gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a box pushed on carpet (d) a rough doormat
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
28. 28.🛞 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 carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a wheel on ball bearings (d) sand on a slippery path
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
32. 32.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
39. 39.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank

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