How Lawn Mower Blades Cut Grass (at 50,000 FRAMES PER SECOND) - Smarter Every Day 196 | Summary and Q&A

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July 1, 2018
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SmarterEveryDay
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How Lawn Mower Blades Cut Grass (at 50,000 FRAMES PER SECOND) - Smarter Every Day 196

TL;DR

Lawn mower blades do not function like scissors; instead, they rely on lift created by the blade's tab to pull the grass up and cut it.

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Questions & Answers

Q: How do lawn mower blades differ from other cutting tools like scissors?

Lawn mower blades do not have opposing blades that create shear stress. Instead, they rely on a lift tab to create airflow and pull the grass up for cutting.

Q: Why is the lift tab important in lawn mower blades?

The lift tab creates airflow that pulls the grass up, allowing the blade to cut it more effectively. Without the lift tab, the grass would not be properly lifted for cutting.

Q: How does the shape of the lawn mower deck affect cutting performance?

The shape of the deck controls the airflow around the blade. Properly designed decks ensure that the grass is pulled up efficiently, resulting in better cutting performance.

Q: Is there a relationship between lift and drag in lawn mower blades?

Yes, lift and drag are proportional. Increasing the lift tab's size might improve cutting performance, but it would also require more energy to turn the blade due to increased resistance.

Summary & Key Takeaways

  • Traditional cutting tools, like scissors, use two opposing blades to create shear stress and cut objects. However, lawn mower blades work differently.

  • Lawn mower blades do not have opposing blades but instead rely on a lift tab to create airflow that pulls the grass up for cutting.

  • Understanding the physics behind lawn mower blades can help improve their design and performance.

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