Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 397 · 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.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
5. 5.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
6. 6.True or false: a grippy rubber sole gives less friction. (a) False (b) True
7. 7.True or false: chalk on a gym bar gives more friction. (a) False (b) True
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
9. 9.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
10. 10.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
12. 12.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
13. 13.🛞 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 4 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
14. 14.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) oil on a squeaky hinge (d) sand on a slippery path
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.True or false: a box pushed on carpet gives more friction. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a smooth steel slide (d) a wheel on ball bearings
20. 20.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a grippy rubber sole (d) sand on a slippery path
21. 21.True or false: a rough doormat gives more friction. (a) True (b) False
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a tyre with deep treads (d) a wheel on ball bearings
25. 25.True or false: sand on a slippery path gives less friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) sand on a slippery path (d) a smooth steel slide
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
35. 35.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
36. 36.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.True or false: skating on ice gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet

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