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"How Lever Works" Construction and Simple Machinery PPT Courseware 2
Archimedes
Archimedes (287 BC - 212 BC) was a famous philosopher, mathematician, physicist and scientist in ancient Greece.
Experience the role of a “good helper”
Give me a fulcrum and I can lift the whole earth
Can he move the earth?
Comparative observation
Looking closely at these two pictures, what do you find in common?
A simple machine like a crowbar is called a lever.
lever
A hard rod that can rotate around a fixed point under the action of force is a lever.
Three key points in leverage
When the lever works, it always rotates around a point, which is called the fulcrum.
The point where force is exerted on the lever is the power point.
The point where the weight is suspended is the point of resistance.
Finding the secret to leverage
Who can tell me what its characteristics are?
1. The horizontal bar can rotate around the fulcrum.
2. The horizontal bar is in a balanced state.
3. There are small grids on the left and right sides of the horizontal bar, with equal distances.
Save effort when the power arm is longer than the resistance arm
When the power arm is equal to the resistance arm, there is no effort
Not effortless either
When the power arm is shorter than the resistance arm, effort is required
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"How Lever Works" Construction and Simple Machinery PPT Courseware:
"How the Lever Works" PPT Courseware on Architecture and Simple Machinery Simple machines like crowbars are called levers. Activity 1: Understanding the Arch Rod 1. What are the three important positions on the lever? 2. What is the function of each location point? There are three important positions on the lever...