Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 504 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) oil on a squeaky hinge
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
6. 6.True or false: chalk on a gym bar gives more friction. (a) True (b) False
7. 7.True or false: a grippy rubber sole gives more friction. (a) True (b) False
8. 8.🛞 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, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
9. 9.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
10. 10.True or false: a wet tiled floor gives more friction. (a) True (b) False
11. 11.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
12. 12.True or false: sand on a slippery path gives less friction. (a) False (b) True
13. 13.🛞 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 12 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
15. 15.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
16. 16.True or false: a rough doormat 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 3 N, a carpet 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a smooth steel slide
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
21. 21.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
22. 22.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a box pushed on carpet (d) a grippy rubber sole
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
26. 26.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
27. 27.True or false: skating on ice gives less friction. (a) False (b) True
28. 28.🛞 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 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) powder on a carrom board (d) oil on a squeaky hinge
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a wooden plank 4 N, a carpet 5 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: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
36. 36.🛞 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 9 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
37. 37.🛞 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 wooden plank 9 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
38. 38.🛞 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 11 N. How many newtons more were needed on a carpet than on ice?
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a smooth steel slide (d) a box pushed on carpet
40. 40.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction

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