Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 224 · 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: chalk on a gym bar? (a) less friction (b) more friction
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
7. 7.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
8. 8.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
9. 9.True or false: a rough doormat gives more friction. (a) False (b) True
10. 10.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
12. 12.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) chalk on a gym bar (d) a wheel on ball bearings
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
15. 15.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) chalk on a gym bar (d) a wet tiled floor
16. 16.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a tyre with deep treads (d) a rough doormat
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wet tiled floor (d) sand on a slippery path
19. 19.True or false: a smooth steel slide gives less friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a smooth steel slide (d) chalk on a gym bar
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) powder on a carrom board (d) a rough doormat
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
24. 24.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
26. 26.True or false: a grippy rubber sole gives more friction. (a) True (b) False
27. 27.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
28. 28.True or false: a wet tiled floor gives more friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
32. 32.🛞 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 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
34. 34.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
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 11 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
38. 38.🛞 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, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
39. 39.True or false: a tyre with deep treads gives less friction. (a) True (b) False
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful

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