Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 145 · 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: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 14 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
2. 2.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
4. 4.True or false: sand on a slippery path gives more friction. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a smooth steel slide (d) skating on ice
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.True or false: a box pushed on carpet gives less friction. (a) True (b) False
8. 8.True or false: a rough doormat gives less friction. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a grippy rubber sole (d) a wet tiled floor
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) powder on a carrom board (d) a grippy rubber sole
11. 11.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
12. 12.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
16. 16.True or false: chalk on a gym bar gives more friction. (a) True (b) False
17. 17.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
18. 18.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
19. 19.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) sand on a slippery path (d) skating on ice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
21. 21.True or false: a rough doormat gives more friction. (a) False (b) True
22. 22.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
23. 23.🛞 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 most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
25. 25.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
26. 26.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
28. 28.True or false: a tyre with deep treads gives more friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
31. 31.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
32. 32.True or false: a wet tiled floor gives more friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
34. 34.🛞 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 carpet 11 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
36. 36.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
38. 38.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) oil on a squeaky hinge (d) skating on ice
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) oil on a squeaky hinge (d) a smooth steel slide
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) chalk on a gym bar (d) a tyre with deep treads

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