Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 989 · 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) chalk on a gym bar (c) a rough doormat (d) a wheel on ball bearings
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
5. 5.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
7. 7.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
8. 8.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
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) a box pushed on carpet (b) sand on a slippery path (c) oil on a squeaky hinge (d) a grippy rubber sole
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
12. 12.True or false: a box pushed on carpet gives less friction. (a) True (b) False
13. 13.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
14. 14.🛞 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 14 N, ice 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
15. 15.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) chalk on a gym bar (d) oil on a squeaky hinge
16. 16.🛞 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 wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
17. 17.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 9 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
20. 20.True or false: sand on a slippery path gives less friction. (a) True (b) False
21. 21.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
22. 22.True or false: a smooth steel slide gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
25. 25.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a wheel on ball bearings (d) a wet tiled floor
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
27. 27.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
28. 28.True or false: a smooth steel slide gives less friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a tyre with deep treads (d) a wheel on ball bearings
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
32. 32.True or false: skating on ice gives more friction. (a) False (b) True
33. 33.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
34. 34.True or false: chalk on a gym bar gives less friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
36. 36.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
37. 37.🛞 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 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
38. 38.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
39. 39.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
40. 40.🛞 More or less friction: skating on ice? (a) more friction (b) less friction

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