Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 507 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
3. 3.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a wet tiled floor
4. 4.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
11. 11.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a smooth steel slide (d) a rough doormat
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
17. 17.True or false: a grippy rubber sole gives less friction. (a) True (b) False
18. 18.True or false: a tyre with deep treads gives less friction. (a) False (b) True
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
20. 20.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
21. 21.🛞 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 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a smooth steel slide (d) chalk on a gym bar
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
24. 24.True or false: chalk on a gym bar gives less friction. (a) False (b) True
25. 25.True or false: a rough doormat gives less friction. (a) False (b) True
26. 26.🛞 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 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
27. 27.True or false: a smooth steel slide gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
29. 29.🛞 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 1 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 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. How many newtons more were needed on a carpet than on ice?
32. 32.True or false: sand on a slippery path gives less friction. (a) True (b) False
33. 33.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
34. 34.True or false: a wet tiled floor gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
37. 37.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
39. 39.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
40. 40.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction

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