"Two Force Balance" Motion and Force PPT Courseware 7

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"Two Force Balance" Motion and Force PPT Courseware 7

review review

What is the content of Newton's first law?

All objects always remain ________ or ________ when no force is exerted on them.

【Think about it】

When no force acts on an object, it can be in a state of rest.

Can an object remain at rest when acted upon by a force?

Observation and reflection one:

What is the condition of the cup in the picture on the left? Is it acted upon by a force? If so, what forces act on it? What relationship might these forces have?

Observation and reflection two:

The picture on the right shows a cargo being lifted at a constant speed. Is it acted upon by any force? If so, what forces act on it? What relationship might these forces have as well?

1. Balanced state

1. Still state

2. Uniform linear motion state

2. Balance

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.

If an object is acted upon by only two forces and is in equilibrium, this situation is called two-force equilibrium.

in conclusion:

Two forces acting on _______ balance each other if _______, _______, and on _______.

2. Draw a schematic diagram of the force on the object.

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.

example

[Example 8]About motion and force, which of the following statements is correct ( )

A. The object is at rest and must not be subject to external forces.

B. An object must remain at rest under the action of a balancing force

C. An object must move in a straight line at a uniform speed under the action of a balancing force

D. A moving object must move in a straight line at a uniform speed under the action of a balancing force.

[Example 9]The physics book is placed on a horizontal table. Among the following pairs of forces, which one is a balanced force ( )

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

Practice in class

1. Among the following statements about the balance of two forces, which one is correct ( )

A. An object is acted upon by two forces. If it is in a state of uniform linear motion, the two forces must be balanced.

B. An object that moves in a straight line at a uniform speed must be affected by a balancing force.

C. If an object is acted upon by a pair of balancing forces, then the object must be at rest.

D. An object is acted upon by a pair of balancing forces. If one of the forces disappears, the other force will also disappear.

2. A book is placed on a horizontal table. Which of the following pairs of forces can balance each other? ( )

A. The pressure of the book on the desktop and the support of the desktop on the book

B. The book is subject to gravity and the pressure of the book on the table

C. The gravity of the book and the support of the book on the desktop

D. The gravity on the book and the gravity on the table

3. Among the following objects, the one with unbalanced forces is ( )

A. Geostationary satellite

B. A helicopter rising vertically at a constant speed

C. Textbooks resting on a horizontal table

D. A train traveling in a straight line at a constant speed on a straight track

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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.

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"Two Force Balance" Force and Motion PPT Courseware 2:

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Update Time: 2024-10-20

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

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