"Newton's First Law" Motion and Force PPT Download

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"Newton's First Law" Motion and Force PPT Download

Part One: Preview Perception

1. The influence of resistance on the movement of objects

1. The smoother the horizontal surface, the smaller the resistance the car encounters, the slower the speed of the car decreases, and the longer the distance the car moves.

2. If the car moves without resistance, the car will move at a constant speed.

2. Newton’s first law

1. Content: All objects always remain at rest or move in a straight line at a uniform speed when no force is acted upon.

2. Derivation process: Newton's first law is summarized through further reasoning based on a large number of empirical facts.

3. Inertia

1. Concept: The property of an object remaining at rest or moving in a straight line at a uniform speed.

2. Properties: Inertia is a universal property of objects.

Newton's First Law PPT, Part 2: Interactive Classroom Understanding

1. Understanding of Newton’s first law

(1) Scope of application: "Everything" means that the law is universally applicable to all objects (whether solid, liquid or gas, whether the object is stationary or moving) and is not a special phenomenon.

(2) Establishment condition: "No force is exerted" includes two situations:

①The object is not acted upon by any force, which is an ideal situation.

②The effects of the forces on the object cancel each other out, which is equivalent to the object not receiving any force.

(3) State: "or" refers to one of the two states of rest and uniform linear motion. That is, the originally stationary object always remains in the "rest" state when no force is acted upon, while the originally moving object remains in the "rest" state. When there is no force acting on it, it always maintains a "uniform linear motion state".

[Example 1] As shown in the figure, when the ball moves along the arc-shaped chute from point A to point B on the horizontal track, if all the external forces on the ball suddenly disappear, then the motion state of the ball will be ()

A. Uniform linear motion B. Stop motion immediately

C. The speed is getting faster and faster D. The speed is getting slower and slower

Analytically, it can be known from Newton's first law of motion that all objects will remain stationary or move in a straight line at a constant speed when not acted upon by external forces. The ball was originally moving. If all the external forces it received suddenly disappeared, it would move in a straight line at a constant speed.

AnswerA

2. Understanding of inertia

(1) All objects have inertia, and objects under any circumstances have inertia.

(2) The size of inertia is only related to the mass of the object. The greater the mass, the greater the inertia. It has nothing to do with factors such as whether the object is subject to force or its state of motion.

(3) Inertia is an attribute of the object itself. It is not a force. It can only be said that the object has inertia, but it cannot be said that the object is subject to inertia, is affected by inertia, or is subject to inertial force.

[Example 2] Regarding the inertia of an object, which of the following statements is correct ()

A. A football has no inertia when it is stationary and has inertia when it is moving.

B. Long jump athletes have to run before taking off in order to gain inertia.

C. It is not easy for a racing car to stop when driving at high speed because the greater the speed, the greater the inertia.

D. Athletes in a 100-meter race cannot stop immediately when they reach the finish line because they have inertia.

Tips This question tests the understanding of inertial phenomena and their applications. The key to solving the problem is to understand that inertia is a property of objects and to be familiar with common inertial phenomena in life.

Analysis: All objects have inertia at any time, so options A and B are both wrong; the size of inertia is only related to the mass of the object, so option C is wrong; when a 100-meter runner reaches the finish line, he must maintain the original state of motion due to inertia. It cannot stop immediately and will continue to move forward for a certain distance, so option D is correct.

Answer D

Newton's first law PPT, part three: try to apply

1. Newton’s first law

1. Which of the following statements about the establishment of "Newton's First Law" is correct ()

A. It is experience gained through daily life

B. It is derived through theory

C. It is directly proven through experiments

D. It is based on experimental facts and summarized through reasoning

2. As shown in the figure, the electric lamp hanging in the classroom is in a stationary state. If all the external forces it receives suddenly disappear, it will ()

A.Accelerate the fall

B.Falling at a constant speed

C. stay still

D. Can move in all directions

3. In the car experiment as shown in the figure, the rougher the surface, the resistance on the car is ________, and its speed is reduced by ________; the smoother the surface, the resistance is ________, and its speed is reduced by ________. When the car is subjected to When the resistance is zero, it will move _________.

2. Inertia

4. Which of the following statements about inertia is incorrect ()

A. Athletes take advantage of inertia when running during the long jump

B. Drivers wear seat belts when driving to reduce inertia

C. After the bicycle stops pedaling, it continues to move forward because both people and vehicles have inertia.

D. The earth rotates from west to east. If a person jumps up vertically and still falls back to the same place, it is because people have inertia.

5. Among the following life phenomena, the one that uses inertia is ()

A. The car slid off the track when turning

B. Cars must drive at the speed limit on the highway

C. People are prone to slipping when they step on the watermelon rind.

D. Long jump athletes should run during the long jump

6. The Ministry of Public Security requires drivers and passengers of small passenger cars to use seat belts, because in the event of a collision, the vehicle body stops moving, while the passenger's body continues to move forward due to ________. At this time, the seat belt will hinder the forward movement of the human body. This Show that force can change the ______________ of an object.

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"Newton's First Law" Motion and Force PPT (Lesson 1):

"Newton's First Law" Motion and Force PPT (Lesson 1) Part 1: Classification practice of knowledge points Knowledge point 1 The influence of resistance on the movement of objects 1. The football rolling on the ground rolls slower and slower, and finally stops because the football is affected by the _____ on the ground.

"Newton's First Law" Motion and Force PPT:

"Newton's First Law" Motion and Force PPT Part 1 Content: Knowledge Points Basic Knowledge Point 1 Effect of Resistance on the Movement of Objects 1. The movement of an object does not require (optional whether it requires or does not require) force to maintain the movement of the object. I stopped because I was blocked...

"End of Chapter Optimization Summary" PPT courseware on the relationship between motion and force:

"End-of-Chapter Optimization Summary" PPT courseware on the relationship between motion and force. Integration and improvement of critical and extreme value problems in dynamics 1. Critical state and critical value In the process of changes in the motion state of an object, when it often reaches a specific state, the relevant physical quantities will change...

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Update Time: 2024-09-07

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

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