"Balance of Forces" Force and Motion PPT Courseware

Description

"Balance of Forces" Force and Motion PPT Courseware

1. Balance state and balance force

1. Balanced state

Stationary state

Uniform linear motion state

2. Balance

the force that keeps an object in equilibrium

3. Balance of two forces

An object is in equilibrium under the action of two forces

2. Second force balance conditions

1. Two force balance conditions

same object

same straight line

equal size

opposite direction

2. The resultant force of the two force balance is zero.

3. The object’s motion state does not change

No force

subject to balancing force

3. Application of two force balance conditions

1. Please draw a schematic diagram of the force on the object in Figure 9-3-2, and analyze whether the object is subject to a balancing force, and which pair of forces is a two-force balance.

1) Stationary hanging electric lamp.

2) The teacup resting on the table.

3) A trailer moving at a constant speed.

Stationary hanging electric lamp. (The pulling force F on the electric lamp and the gravity G are balanced by the two forces)

The tea cup resting on the table. (The support force N and gravity G on the cup are balanced)

A trailer moving at a constant speed. The supporting force N and gravity G of the trailer are balanced, and the traction force F and resistance f are balanced.

Consolidation exercises

1. Among the forces exerted on a book placed on a horizontal table, which one is a balancing force?

A. The pressure of the book on the tabletop and the gravity of the book;

B． The pressure of the book on the tabletop and the support of the tabletop on the book;

C. The gravity of the book and the support of the book on the tabletop;

D． The pressure of the book on the desktop plus the gravity of the book and the support of the book on the desktop.

2. When the crane's wire rope lifts a heavy object, please compare: when the weight is stationary, when the weight rises at a constant speed, and when the weight drops at a constant speed, the pulling force of the wire rope on the weight is:

A. When the weight rises at a constant speed, the pulling force is maximum

B． When the weight is stationary, the pulling force is greatest

C. When a heavy object falls at a constant speed, the pulling force is maximum

D． In the above three cases, the pulling force is the same

3. Why does an object move in a straight line at a constant speed when measuring sliding friction? (measuring gravity)

4. The resistance of an object thrown vertically is related to the speed. The greater the speed, the greater the resistance. Try to analyze the position where the resultant force is the largest during the entire process of the object rising and falling.

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Update Time: 2024-07-30

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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