Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 609 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
3. 3.🛞 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 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
4. 4.🛞 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 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
5. 5.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
6. 6.True or false: chalk on a gym bar gives more friction. (a) True (b) False
7. 7.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
8. 8.True or false: sand on a slippery path gives less friction. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a tyre with deep treads
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) skating on ice (d) powder on a carrom board
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
17. 17.🛞 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 most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a grippy rubber sole (d) chalk on a gym bar
19. 19.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a tyre with deep treads (d) skating on ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
27. 27.🛞 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 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
29. 29.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
30. 30.True or false: a smooth steel slide gives more friction. (a) True (b) False
31. 31.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
34. 34.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
36. 36.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) skating on ice (d) a tyre with deep treads
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
40. 40.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction

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