Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 299 · 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: sandpaper 10 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
2. 2.True or false: a tyre with deep treads gives less friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a tyre with deep treads (d) chalk on a gym bar
4. 4.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
6. 6.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
7. 7.🛞 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 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
8. 8.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) powder on a carrom board
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) oil on a squeaky hinge (d) sand on a slippery path
11. 11.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a rough doormat (d) a box pushed on carpet
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) skating on ice
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
15. 15.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a rough doormat (d) powder on a carrom board
18. 18.True or false: a box pushed on carpet gives more friction. (a) False (b) True
19. 19.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
20. 20.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
22. 22.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a grippy rubber sole (d) a smooth steel slide
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
25. 25.True or false: a wet tiled floor gives more friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
27. 27.True or false: chalk on a gym bar gives more friction. (a) True (b) False
28. 28.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
30. 30.True or false: skating on ice gives less friction. (a) True (b) False
31. 31.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
32. 32.🛞 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, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
35. 35.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
36. 36.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
40. 40.True or false: a rough doormat gives less friction. (a) True (b) False

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