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"Conditions for Balance of Two Forces" PPT courseware
Part One: 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 acted upon by two forces. Cargo moves in a straight line at a uniform speed.
(1) When an object is acted upon by a balancing force, whether it is at rest or moving in a straight line at a uniform speed depends on the initial state of the object.
(2) If an object remains at rest or moves in a straight line at a uniform speed, the force it experiences must be a balanced force
practise
1. A hot air balloon descends at a constant speed. Are the gravity and traction forces on it a pair of balanced forces? (not counting air resistance)
2. Xiao Zhang used a horizontal thrust to push the podium on the horizontal ground, but the result was that there was no push. Are the friction force and horizontal thrust on the podium table from the ground a pair of balancing forces?
think
If two forces acting on an object balance each other, what conditions need to be met for the two forces?
PPT on the conditions for the balance of two forces, part 2: Exploration - the conditions for the balance of two forces
think:
1. The object of study is a plastic plate. How many forces are exerted on it? What are the differences?
3 gravity, pull force on both sides.
2. If the influence of gravity is to be ignored, what are the requirements for plastic boards?
----The gravity of the plastic plate is much less than the pulling force on both sides. (Plastic boards are much lighter than hook codes)
Activity 1: Study the impact of the relationship between the magnitude of two forces on balance.
Hang hooks of unequal weight on both sides, release the plastic board, and the plastic board will ____________________.
Hang hooks of equal weight on both sides. Let go of the plastic plate, which will ____________.
Conclusion: For two forces to balance each other, the magnitude of the two forces must be ______.
Activity 2: Study the impact of the relationship between the two force directions on balance.
Hang hooks of equal weight on both sides and move the plastic plate downward slightly so that the directions of the two pulling forces are not opposite. After you release the plastic plate, the plastic plate will ___________. When the plastic plate is at rest, the directions of the two pulling forces are ___________.
Conclusion: For two forces to balance each other, the directions of the two forces must be ______.
PPT on the conditions of balance of two forces, part 3: practice in class
The book is placed on a horizontal table. Among the following pairs of forces, which one is a balancing force ( )
A. The gravity of the book and the pressure of the book on the table
B. The pressure of the book on the desktop and the support of the desktop on the book
C. The gravity of the book and the support force of the ground facing the table
D. The gravity of the book and the support of the book on the table
A magnet is attached to a vertically suspended magnetic blackboard. The magnet is stationary. Which of the following four pairs of forces can balance each other ( )
A. The attraction of the blackboard to the magnet and the attraction of the magnet to the blackboard
B. The attraction of the blackboard to the magnet and the friction of the blackboard to the magnet
C. The attraction of the blackboard to the magnet and the gravity of the magnet
D. The gravity of the magnet and the friction force of the blackboard on the magnet
Conditions for balance of two forces PPT, part 4 content: Discussion:
What benefits does the two-force equilibrium condition have for us?
The meaning of two force balance:
1. Apply two-force balance to determine the motion state of an object
2. Apply two-force balance to find the force. Know the magnitude and direction of one of the two forces that balance each other, and find the magnitude and direction of the other force.
3. Can analyze the stress of objects
PPT on the conditions for the balance of two forces, part five: summary
1. Balance state and balance force
Balanced state
Stationary state
Uniform linear motion state
The force is a balancing force
2. Second force balance conditions
①Two forces act on the same object
②Equal in size
③Opposite direction
④ Act on the same straight line
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"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?