Podcast
Questions and Answers
Which method is NOT typically used to reduce friction?
Which method is NOT typically used to reduce friction?
- Using ball bearings
- Oiling
- Polishing
- Heating (correct)
Streamlining is a method used to reduce friction in liquids and gases.
Streamlining is a method used to reduce friction in liquids and gases.
True (A)
Match the methods of reducing friction with their descriptions:
Match the methods of reducing friction with their descriptions:
Oiling = Making surfaces smoother Polishing = Smoothing rough surfaces Streamlining = Designing shapes to minimize drag Anti-friction alloys = Using materials with lower friction coefficients
What principle do air-cushion vehicles operate on to reduce friction?
What principle do air-cushion vehicles operate on to reduce friction?
Using ______ reduces friction by converting sliding friction into rolling friction.
Using ______ reduces friction by converting sliding friction into rolling friction.
What is the primary purpose of polishing surfaces?
What is the primary purpose of polishing surfaces?
Friction is always beneficial for mechanical systems.
Friction is always beneficial for mechanical systems.
What shape is associated with minimizing friction for moving objects in air or water?
What shape is associated with minimizing friction for moving objects in air or water?
Friction can be reduced by using ______ that are made of ceramic or hard steel.
Friction can be reduced by using ______ that are made of ceramic or hard steel.
Which of the following materials is typically used as an anti-friction alloy?
Which of the following materials is typically used as an anti-friction alloy?
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Study Notes
Methods of Reducing Friction
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Oiling: Lubrication reduces friction by making surfaces smoother, enhancing machine movement.
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Polishing: Using suitable materials to polish surfaces creates smoother contact areas, lowering friction.
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Streamlining: Designing objects with a narrow front and back and a broad center minimizes friction with fluids (water or air). Common examples include birds, ships, boats, and airplanes.
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Anti-friction alloys: When steel slides over steel, friction increases. Replacing steel with alloys like bronze in moving parts decreases frictional contact.
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Air cushions: A thin layer of compressed air between moving surfaces significantly reduces friction. This principle is utilized in hovercraft technology.
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Ball bearings: These devices convert sliding friction into rolling friction, significantly lowering resistance between machine parts. Made of ceramic or hard steel, ball bearings facilitate smoother movement.
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