Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 343 · 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: a rough doormat? (a) less friction (b) more friction
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.True or false: a box pushed on carpet gives less friction. (a) True (b) False
7. 7.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
8. 8.True or false: powder on a carrom board gives more friction. (a) True (b) False
9. 9.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
10. 10.True or false: a rough doormat gives more friction. (a) True (b) False
11. 11.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
13. 13.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
16. 16.True or false: chalk on a gym bar gives more friction. (a) False (b) True
17. 17.🛞 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 9 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
20. 20.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
21. 21.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
22. 22.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
23. 23.True or false: sand on a slippery path gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) sand on a slippery path (d) a wet tiled floor
25. 25.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) a wheel on ball bearings
26. 26.True or false: skating on ice gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) a smooth steel slide
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a smooth steel slide (d) a wheel on ball bearings
33. 33.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
38. 38.True or false: a box pushed on carpet gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
40. 40.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) sand on a slippery path (d) chalk on a gym bar

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