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Authoritative PPT Summary
"Two Force Balance" Motion and Force PPT Courseware 4
1. Balanced state
Objects remain in _____ or _____________ state.
2. Conditions for balance of two forces
(1) Act on _____ objects.
(2) Size _____.
(3) Direction _____.
(4) On the _______ straight line.
[Instructions from famous teachers] Two methods to determine whether the two forces on an object are a pair of balanced forces
(1) The two forces satisfy the conditions of two-force balance;
(2) The object is at rest or in uniform linear motion under the action of these two forces.
3. Application of two force balance conditions
(1) When an object is in equilibrium under the action of two forces, the _____ and _____ of the other force can be determined based on the magnitude and direction of one of the forces.
(2) If the force on an object is a balanced force, the object is in a _____ or _____________ state.
1. (2012·Heze High School Entrance Examination) In the following examples, the object acted upon by the balancing force is ( )
A. A roller coaster moving on a circular track
B． Slowing down the train entering the station
C. A rocket rising into the sky accelerating
D． A car traveling in a straight line at a constant speed on the road
[Analysis] Choose D. When an object is acted upon by a balancing force, its state of motion remains unchanged. The speed and direction of the roller coaster moving on the circular track are changing. The speed of the train decelerating into the station and the rocket taking off and accelerating upward are changing, so they What is received is not a balance force, A, B, and C are wrong; the motion state of a car traveling in a straight line at a constant speed on the road has not changed, so what it receives is a balance force, D is correct. Therefore, choose D for this question.
2. (2011 Nanchong High School Entrance Examination) In the schematic diagram of the four forces shown in the figure, the two forces that balance each other are ( )
[Analysis] Choose D. The two forces in item A are not equal in magnitude and are not a pair of balanced forces; the two forces in item B do not act on the same straight line and are not a pair of balanced forces; the two forces in item C do not act on the same object and are not a pair of balanced forces. For balanced forces; the two forces in item D are equal in magnitude, opposite in direction, act on the same straight line, and act on the same object, so they are a pair of balanced forces.
3． (2012·Nanchong High School Entrance Examination) An object is placed on a horizontal table. Which of the following pairs of forces is a balanced force ( )
A. The gravity of the object and the pressure of the object on the horizontal table
B. The gravity on the object and the support force of the horizontal table on the object
C. The supporting force of the object and the pressure of the object on the horizontal table
D. The gravity of the table and the pressure of the object on the horizontal table
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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:
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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?
"Two Force Balance" Force and Motion PPT Courseware 2:
"Two Force Balance" Force and Motion PPT Courseware 2 Observation: When a car is at rest, is it affected by external forces? Observation: The plane can maintain uniform linear motion in the air. Does it receive any force? 1. Equilibrium state: An object is acted upon by two (or more) forces..