Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 755 · 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: writing with a pencil? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) skating on ice (d) powder on a carrom board
5. 5.True or false: chalk on a gym bar gives less friction. (a) True (b) False
6. 6.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
7. 7.True or false: a tyre with deep treads gives more friction. (a) False (b) True
8. 8.🛞 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 4 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
9. 9.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
10. 10.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
11. 11.True or false: a box pushed on carpet gives less friction. (a) True (b) False
12. 12.True or false: sand on a slippery path gives more friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
14. 14.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) skating on ice (d) a tyre with deep treads
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a rough doormat (d) sand on a slippery path
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) chalk on a gym bar (d) a smooth steel slide
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
22. 22.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
23. 23.True or false: a tyre with deep treads gives less friction. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
25. 25.True or false: a rough doormat gives less friction. (a) False (b) True
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
27. 27.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
29. 29.True or false: skating on ice gives more friction. (a) False (b) True
30. 30.🛞 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 11 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
34. 34.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
35. 35.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
36. 36.🛞 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 6 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 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 9 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
40. 40.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False

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