Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 854 · 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.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
2. 2.True or false: chalk on a gym bar gives less friction. (a) False (b) True
3. 3.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
6. 6.True or false: powder on a carrom board gives less friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a grippy rubber sole
8. 8.🛞 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, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
10. 10.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
11. 11.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
12. 12.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
13. 13.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) sand on a slippery path (d) a rough doormat
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
18. 18.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) powder on a carrom board
20. 20.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a smooth steel slide (d) chalk on a gym bar
21. 21.🛞 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 wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (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 wooden plank 6 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
25. 25.True or false: a box pushed on carpet gives less friction. (a) False (b) True
26. 26.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
27. 27.True or false: a rough doormat gives more friction. (a) True (b) False
28. 28.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
29. 29.🛞 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. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
31. 31.True or false: a tyre with deep treads gives less friction. (a) True (b) False
32. 32.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
33. 33.True or false: chalk on a gym bar gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
35. 35.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: a grippy rubber sole gives less friction. (a) True (b) False
38. 38.🛞 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, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
39. 39.True or false: sand on a slippery path gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids