Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 505 · 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: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
2. 2.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
4. 4.True or false: chalk on a gym bar gives less friction. (a) True (b) False
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 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
8. 8.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
9. 9.🛞 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 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) skating on ice (d) a tyre with deep treads
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
13. 13.True or false: a smooth steel slide gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) oil on a squeaky hinge (d) a smooth steel slide
16. 16.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
17. 17.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
18. 18.🔍 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
19. 19.True or false: sand on a slippery path gives less friction. (a) True (b) False
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
23. 23.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a rough doormat
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
25. 25.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
26. 26.🛞 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 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
27. 27.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
28. 28.True or false: a wet tiled floor gives more friction. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) chalk on a gym bar (d) a wheel on ball bearings
30. 30.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) oil on a squeaky hinge (d) a wet tiled floor
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
32. 32.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
35. 35.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
36. 36.True or false: sand on a slippery path gives more friction. (a) False (b) True
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
39. 39.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) a smooth steel slide
40. 40.🛞 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 wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank

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