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Authoritative PPT Summary
"Newton's First Law of Inertia" Force and Motion PPT Courseware 2
Who do you think is right?
First view
When riding a scooter, if you don't step on the ground, the scooter will eventually stop. Explain that force is required to maintain the motion of objects.
Second view:
When the scooter is sliding, no one is stepping on the ground, and the scooter continues to move forward. Explain that no force is required to maintain the motion of an object. The car stops because of resistance.
Since ancient times, many people have believed that the movement of objects requires force to maintain it.
Galileo believed that the motion of an object does not require force to maintain it. The reason why a moving object stops is because of resistance.
1. Newton’s first law
All objects always remain at rest or move in a straight line at a uniform speed when no force is acted upon.
Law interpretation
1. "Everything" applies to all objects.
2. "No force is acted upon" is the condition for the law to be established.
3. "General" remains unchanged.
Newton's first law is also called the law of inertia
Why do objects remain at rest or move in a straight line at a uniform speed?
No force. (not external cause)
(Looking for internal causes) The properties of the object itself
2. Inertia:
All objects have the property of maintaining their original state of motion. This property is called inertia.
Can you use the knowledge of inertia to explain the following phenomena?
If a cup is filled with milk and the cup is suddenly pulled rapidly, what will happen? Why?
Milk spills to the right. Because the milk is in a stationary state at first, when the quilt suddenly moves to the left, the milk has to remain stationary due to inertia, so it spills to the right side of the cup.
Why does a running person fall forward when his foot gets caught?
A running person starts to move forward and stops when his feet are tripped. However, the body has inertia and needs to maintain forward motion and continue to move forward, so the person falls forward.
Concept interpretation
1. Inertia has no conditions. Any object has inertia at all times.
2. Inertia has no direction. The object simply maintains its previous state of motion.
Consolidation exercises
1. Regarding inertia, the following statement is correct ( ).
A. The property that all objects always maintain a state of uniform linear motion or rest when no force is acted upon is called inertia
B． The fired bullet leaves the muzzle and continues to move forward at high speed because the bullet is affected by inertia.
C. The reason why a car can continue to move forward after turning off the engine is because the car's inertia is greater than the resistance it encounters
D． All objects have inertia under any circumstances
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"Newton's First Law of Inertia" Force and Motion PPT Courseware 3:
"Newton's First Law of Inertia" Force and Motion PPT Courseware 3 What is the relationship between force and motion? Aristotle (384 BC 322 BC) was an ancient Greek Scytara native, a famous philosopher, scientist, and educator. The motion of an object requires force...
"Newton's First Law of Inertia" Force and Motion PPT Courseware:
"Newton's First Law of Inertia" Force and Motion PPT courseware Summary of knowledge points and course standard requirements 1. Thoroughly understand Newton's first law, and be able to know the state of motion from the state of force, or know the state of force from the state of motion. 2. Understand the concept of inertia and use inertial knowledge to solve...