"Two Force Balance" Motion and Force PPT Courseware 3

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"Two Force Balance" Motion and Force PPT Courseware 3

1. Balance of forces

1. If an object remains at rest or moves in a straight line at a uniform speed when acted upon by several forces, we say that these forces are balanced.

2. The state of rest and the state of uniform linear motion are also called equilibrium states.

Two force balance is the simplest. So what two forces can keep an object in equilibrium?

Explore the conditions for balance of two forces

guess:

Both forces should be on the same object

The magnitude of the two forces may be equal

The directions of the two forces may be opposite

The two forces may have to be in a straight line

Experimental method: Change the three elements of the two forces on the object. When the object is at rest, the two forces are balanced.

experiment one

As shown in the picture, hang hooks of unequal weight on the rope sets on both sides. Let go of the plastic board, the plastic board _____.

Experiment 2

The device is still as shown above, but hooks of equal weight are hung on the rope sets on both sides. After releasing the plastic plate, the plastic plate will .

2. Second force balance conditions

Two forces acting on the same object balance each other if they are equal in magnitude, opposite in direction, and in the same straight line.

Abbreviation: same body, equal size, reverse, collinear.

2. The crane lifts a heavy object at a constant speed of 1 m/s. The pulling force of the wire rope on the heavy object is 6000 N. If the crane lifts the object and drops it at a constant speed of 2 m/s, the pulling force of the wire rope on the weight is ( ).

A. 12 000 N B. 6 000 N

C. 3 000 N D. Unable to determine

3． The physics book is placed on a horizontal table. The following are equilibrium forces ( ).

A. The gravity of the physics book and the pressure of the physics book on the desktop

B． The pressure of the physics book on the desktop and the support of the desktop on the physics book

C. The physical gravity and the support force of the ground on the table

D． The gravity of the physics book and the support force of the desktop on the physics book

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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:

"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..

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Update Time: 2024-09-09

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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