Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 979 · 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: a grippy rubber sole? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
3. 3.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.True or false: a smooth steel slide gives less friction. (a) True (b) False
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) skating on ice (d) powder on a carrom board
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 16 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
12. 12.True or false: powder on a carrom board gives less friction. (a) True (b) False
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
17. 17.True or false: a grippy rubber sole gives less friction. (a) True (b) False
18. 18.True or false: skating on ice gives more friction. (a) False (b) True
19. 19.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a grippy rubber sole
23. 23.True or false: a wet tiled floor gives more friction. (a) True (b) False
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
26. 26.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
27. 27.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
28. 28.🛞 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 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
30. 30.🛞 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 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) chalk on a gym bar (d) a wet tiled floor
33. 33.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
35. 35.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
36. 36.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) sand on a slippery path (d) a grippy rubber sole
37. 37.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
39. 39.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
40. 40.True or false: a wheel on ball bearings gives more friction. (a) False (b) True

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