Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 141 · 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.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
2. 2.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
3. 3.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
6. 6.True or false: a grippy rubber sole gives more friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) oil on a squeaky hinge (d) a grippy rubber sole
11. 11.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a wheel on ball bearings (d) chalk on a gym bar
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a tyre with deep treads (d) a wet tiled floor
14. 14.True or false: a wet tiled floor gives more friction. (a) False (b) True
15. 15.🛞 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 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a tyre with deep treads (d) powder on a carrom board
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
19. 19.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a tyre with deep treads (d) skating on ice
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a tyre with deep treads (d) a smooth steel slide
24. 24.True or false: a rough doormat gives less friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
29. 29.True or false: a smooth steel slide gives more friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
31. 31.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
32. 32.🛞 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 9 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) powder on a carrom board (d) a tyre with deep treads
34. 34.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
35. 35.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) chalk on a gym bar (d) oil on a squeaky hinge
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
37. 37.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
38. 38.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
39. 39.True or false: chalk on a gym bar gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet

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