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Questions and Answers
What is the main purpose of using lubricants like oil and grease in machinery?
What is the main purpose of using lubricants like oil and grease in machinery?
- To reduce the efficiency of the machinery
- To add extra weight to the machinery
- To increase friction between moving parts
- To minimize wear and tear on the moving parts (correct)
What is the role of drag forces, such as air resistance or water resistance, on moving objects?
What is the role of drag forces, such as air resistance or water resistance, on moving objects?
- To slow down the moving objects (correct)
- To speed up the moving objects
- To reduce the friction between the moving objects and their surroundings
- To minimize wear and tear on the moving objects
Why does the friction occur between seemingly smooth surfaces?
Why does the friction occur between seemingly smooth surfaces?
- Because the surfaces are actually not smooth, but have rough textures (correct)
- Due to the absence of any force acting against the surfaces
- Because of the presence of lubricants on the surfaces
- Due to the absence of any rough textures
What is the primary function of lubricants like oil and grease in machinery?
What is the primary function of lubricants like oil and grease in machinery?
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What is the main purpose of streamlining to minimize drag forces?
What is the main purpose of streamlining to minimize drag forces?
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Why does friction occur on surfaces that may feel smooth?
Why does friction occur on surfaces that may feel smooth?
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Study Notes
- Friction is a force that opposes motion between two objects, such as a car tire and the road
- Friction can be useful, like the friction between shoes and the ground for walking or hands and objects for gripping
- Surfaces may feel smooth but are not, causing friction due to their rough textures
- Reducing friction between moving parts in machinery prevents wear and increases efficiency, using lubricants like oil and grease
- Drag forces, also known as air resistance or water resistance, act against moving objects to slow them down, requiring streamlining to minimize these forces for improved speed and performance.
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