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Authoritative PPT Summary
"Balance of Two Forces" Motion and Force PPT Courseware 2
What is the content of Newton's first law?
Newton's first law:
Content: All objects always remain at rest or move in a straight line at a uniform speed when they are not acted upon by external forces.
1. Balance state and balance force
When an object remains at rest or moves in a straight line at a constant speed under the action of several forces, we say that these forces are mutually balanced. The object is in equilibrium.
equilibrium state: resting state
or uniform linear motion state
If an object remains at rest or moving in a straight line at a uniform speed when acted upon by two forces, we say that the two forces are balanced. That is the balance of two forces.
The situation of two force balance is the simplest.
Let's study this problem experimentally.
exercise
1. Place a physics book on a horizontal table. When the book is stationary, the balancing force on the book is ( )
A. The gravity of the book and the pressure of the book on the table.
B. The gravity of the book and the supporting force of the table on the book
C. The pressure of the book on the desktop and the support of the desktop on the book
D. The gravity on the table and the pressure of the book on the tabletop
(3) Application of two force balance conditions
Question 1: What is the principle of using a spring dynamometer to measure the gravity of an object?
Question 2: What is the balancing force on the vase on the table? What other force does the vase exert on the table?
Question 3: What forces are exerted on the chandelier? What is the relationship?
Example 1: Which of the following analyzes are about the balance of two forces?
correct?
A. A raindrop falling vertically from a high altitude is already moving at a constant speed when it approaches the ground. The force it receives is a pair of balancing forces.
B. Use a rocket to launch a satellite. At the beginning, the upward thrust obtained by the engine jet is balanced with the gravity of the rocket.
C. The moon rotates around the earth at a constant speed. It experiences the gravity of the earth and the gravity of the sun. These two forces are balanced.
D. The wooden block floats at rest on the water, and the buoyancy force it receives from the water is in the opposite direction to gravity.
Summary - What did you learn in this lesson?
1. The balance and equilibrium state of forces: ①Multiple force balance ②Two force balance
2. Two force balance conditions:
3. Application of two-force equilibrium conditions
4. Expansion: analysis of forces, comparison of two force balance and interaction of two forces
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For more information about the PPT courseware "Motion and Forces and Balance of Two Forces", please click on the "Movement and Forces ppt Two Forces Balance ppt" tab.
"Conditions for Balance of Two Forces" PPT courseware:
"Conditions for Balance of Two Forces" PPT courseware Part 1: Observation How many forces act on the chandelier? How is your exercise status? The chandelier is acted upon by two forces. The chandelier is stationary. How many forces are exerted on the cargo? How is your exercise status? The cargo is subject to two forces...
"Conditions for Balance of Two Forces" PPT:
"Conditions for Balance of Two Forces" PPT Part One Content: Scenario Exploration We know that force is the cause of changing the motion state of an object. All objects around us are subject to forces without exception, but why do many objects still maintain their motion state unchanged?
"Two Force Balance" Force and Motion PPT Courseware 2:
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