Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 424 · 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.True or false: chalk on a gym bar gives more friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
4. 4.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
6. 6.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a grippy rubber sole (d) a wet tiled floor
8. 8.True or false: a smooth steel slide gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 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?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
11. 11.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) powder on a carrom board (d) oil on a squeaky hinge
13. 13.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) skating on ice (d) a tyre with deep treads
14. 14.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
15. 15.🛞 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 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
16. 16.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
17. 17.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
18. 18.🛞 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 10 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
19. 19.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
21. 21.True or false: chalk on a gym bar gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
26. 26.True or false: a box pushed on carpet gives less friction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
28. 28.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
29. 29.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wheel on ball bearings (d) sand on a slippery path
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
31. 31.True or false: a wet tiled floor gives less friction. (a) False (b) True
32. 32.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
33. 33.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
34. 34.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
37. 37.True or false: a rough doormat gives less friction. (a) True (b) False
38. 38.True or false: powder on a carrom board gives less friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a box pushed on carpet (d) a tyre with deep treads
40. 40.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction

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