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Authoritative PPT Summary
"Exploring the Equilibrium Conditions of Levers" Force and Machinery PPT Courseware
teaching objectives
1. Know what leverage is
2. Be able to draw a schematic diagram of a lever based on the actual object
3. Know the equilibrium conditions of leverage
Preview test 1. Understanding leverage
Definition induction
Common feature
1. The role of force
2. Rotate around a fixed point
3. Relatively hard
Leverage definition
A hard rod that can rotate around a fixed point under the action of force is called a lever.
Try it: Human Lever
When you bend your elbow to lift something heavy, your arm also acts as a lever (pictured). The elbow joint is the fulcrum.
When you lift your heel, the muscles behind the heel are working, the toes are the fulcrum, and the weight falls between them. This is actually a lever (pictured), where the pulling force of the muscles is smaller than the body weight.
What is a moment arm?
The moment arm is the vertical distance from the fulcrum to the line of action of the force.
Think and discuss:
1. Does the moment arm have to be on the lever?
2. Are the levers straight?
3. If the line of action of the force passes through the fulcrum, what is the moment arm?
Think about it: What did we learn today?
Lever definition: A lever is a ___ that can rotate around a certain ____ under the action of __.
How to draw the lever arm:
Draw the ____ line of action of action and resistance
Draw a perpendicular line through the fulcrum to the line of action of the force
Five elements of leverage:
Fulcrum: A fixed point around which a lever rotates
Momentum: the force that causes a lever to turn
Resistance: the force that prevents a lever from turning
Power arm: the distance from the fulcrum to the power action line
Resistance arm: the distance from the fulcrum to the resistance line
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"Scientific Inquiry: Balance Conditions of Lever" Machinery and Human PPT Courseware 4:
"Scientific Inquiry: Balance Conditions of Lever" Machinery and Man PPT Courseware 4 Activity 1 Observe and experience: ① Clamp things with tweezers ② Cut paper with scissors ③ Use a ruler to pry the stationery box Take a look: the tools in the picture, think and discuss them Common Characteristics at Work Activity 2 Explore..
"Scientific Inquiry: Balance Conditions of Lever" Machinery and Human PPT Courseware 3:
"Scientific Inquiry: Balance Conditions of Levers" Machinery and Human PPT Courseware 3 What levers have in common: ① They are all hard rods. (Soft ones are not acceptable, straight or curved ones are acceptable) ② It is rotating during the working process, and there is one point that does not move during the rotation process. ③It is also subject to the action of two forces.
"Scientific Inquiry: Balance Conditions of Lever" Machinery and Human PPT Courseware 2:
"Scientific Inquiry: Balance Conditions of Levers" Machinery and Man PPT Courseware 2 Learning Objectives 1. Extract common characteristics by observing various levers in life and production labor, and understand the five elements of levers; 2. Be able to analyze the characteristics of levers according to certain standards. Features and effects of use...