"Newton's First Law" Motion and Force PPT Courseware 4

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"Newton's First Law" Motion and Force PPT Courseware 4

Want to discuss:

What is the relationship between motion and force?

1. How do objects move?

2. If there is no force on a moving object, how will the object move?

Is force required to maintain movement?

You must have had this life experience: when riding a bicycle on flat ground, even if you don't step on the pedal, the bicycle will move forward for a certain distance, but because you don't use any more force, it will eventually stop. This kind of phenomenon is often encountered in life.

For example: a train with a shut down engine will stop

The free swing will stop

And the ball that is hit will also stop.

1. Historical review:

1. Aristotle’s point of view:

More than 2,000 years ago, the ancient Greek philosopher Aristotle put forward a point of view based on people's understanding of the relationship between motion and force at that time:

A force must act on an object to keep it in motion.

Force is what keeps objects moving

2. Galileo’s ideal experiment

The motion of an object does not need to be maintained over time

Please consider the following questions:

1. Why does the same car have to be released from the same slope and from the same height every time?

2. What factors are related to the distance the car slides on the plane? What does it matter?

3. Why did the car finally stop? (Why did the car stop?)

The reason a moving car slows down and eventually stops is due to frictional resistance.

Is this conclusion confirmed experimentally?

This conclusion is based on reliable facts and obtained through scientific reasoning. It cannot be confirmed through experiments, but its conclusion is consistent with scientific principles.

3. 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.

1) All objects obey Newton’s first law.

2) "Newton's first law" expresses the law of motion of an object when there is no external force

3) When there is no force on an object, it will always remain at rest, and it will always keep its original speed and direction and continue to move in a straight line. Objects have the property of maintaining their original state of motion.

4) The motion of an object does not require force to maintain it.

5) Newton's first law cannot be directly verified by experiment.

Inertia: The property of an object maintaining its original state of rest or uniform linear motion is called inertia.

(1) Inertia is an inherent property of an object.

(2) Mass---is the only measure of inertia.

Inertia has nothing to do with external conditions such as the object's state of motion and location.

(3) Inertia phenomenon: Under certain conditions, objects appear due to inertia.

Can correctly explain the phenomenon of inertia.

Newton's first law is also called the law of inertia

Example question analysis:

example 1. If the external force on an object that is doing curved motion disappears at the same time, then it will ( )

A. The object stops immediately

B． The object continues to move in a curve

C. The object will move in a straight line with uniform speed

D． The object will change direction of motion

Example 2. Regarding the relationship between force and motion, which of the following statements is correct ( )

A. Objects move when they are acted upon by force

B. Force changes the state of motion of an object

C. Stop exerting force and the moving object will stop

D． Force is what keeps an object at rest or moving in a straight line at a constant speed

summary:

1. It has taken a long time for people to understand the laws of motion of objects. The law of motion of an object when there is no force is the result of Aristotle's restraint of people's thoughts for nearly two thousand years, Galileo's scientific reasoning, and finally Newton's analysis of facts, summary, and generalization, and the inference of Newton's first law.

2. Newton’s first law:

All objects always maintain a state of uniform linear motion or a state of rest when they are not acted upon by external forces.

3. The important contributions of Newton’s first law are:

(1) Force is not what maintains the motion of objects

(2) Force is what changes the state of motion of an object.

From Newton's first law, we know that objects have the property of maintaining a state of uniform linear motion and a state of rest. We get the concept of inertia: any object has the property of maintaining a state of uniform linear motion or a state of rest. This property of an object is called inertia. Therefore Newton The first law of motion is also called the law of inertia.

1. Inertia is an attribute of the object itself. All objects have inertia, that is, no matter whether the object is stationary or moving, whether it is receiving force or not, it has inertia at any time and in any state.

2. Inertia is not a force. When answering questions, you can only say "due to inertia" or "having inertia". You cannot say "subject to inertia", "due to the effect of inertia", "overcoming inertia", etc., otherwise the sum of inertia and inertia will be combined. The effects are confused.

3. All objects have inertia, but the inertia of different objects is different. The inertia of an object is only related to the mass of the object. The greater the mass of the object, the greater the inertia; the smaller the mass of the object, the smaller the inertia and the mass. is a measure of the inertia of an object.

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Update Time: 2024-10-06

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