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Authoritative PPT Summary
"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 a Scytara native of ancient Greece, a famous philosopher, scientist, and educator.
The motion of an object requires force to maintain it.
Descartes was a famous French philosopher, mathematician, and physicist.
One of the founders of analytic geometry.
Born on March 31, 1596 in a noble family in Tulum.
Died in Stockholm on February 11, 1650.
Galileo Galilei (1564-1642), Italian physicist, astronomer and philosopher, pioneer of modern experimental science.
Newton was a great British mathematician, physicist, astronomer and natural philosopher. Born on December 25, 1642 in the village of Walthorpe near Grantham, Lincolnshire, England, and died of illness in London on March 20, 1727.
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.
1. Newton's first law cannot be directly verified by experiments.
2. The movement of an object does not require force to maintain it. Force is what changes the state of motion of an object.
2. Inertia
Use the ruler to quickly hit the lower chess piece. The upper chess piece remains stationary and falls below.
Discussion 1: What other small experiments can you design to demonstrate this property of objects?
Discussion 2: Do stationary objects have this property, and do moving objects have this property?
The property of all objects to remain in a constant state of motion is called inertia. (i.e. stationary or uniform linear motion state)
How is the inertia of the objects in the following questions reflected?
(1) The book resting on the table?
(2) A car moving at 10m/s?
(3) An accelerating car has a speed of 5m/s at a certain moment.
3. Analysis of inertia phenomenon
Explanation method:
1. Explain the original status of the research object.
2. Physical process (sudden occurrence)
3. The research object must maintain its original state due to inertia.
Figure A: When the stationary car and the wooden block are suddenly pulled, the car and the bottom of the wooden block move forward together, and the upper part of the wooden block remains stationary due to inertia, so it will fall backwards.
Picture B: When the moving car and wooden block encounter an obstacle, the bottom of the car and wooden block suddenly stops. The upper part of the wooden block still keeps moving due to inertia, so the small wooden block will fall forward.
practise
1. Regarding the relationship between motion and force, which of the following statements is correct ( )
A. A force must act on an object in order for the object to move. Without force, the object will stop.
B. Force is the reason that changes the state of motion of an object
C. When the motion state of an object changes, a force must act on the object
D. When an object moves in a straight line, it must be acted upon by a force
2. Which of the following phenomena utilize inertia ( )
A. When patting the clothes, the dust comes off the clothes
B. The driver and front-seat passengers must wear seat belts
C. After washing your hands, shake off the water droplets on your hands vigorously
D. Long jump athletes should run as hard as possible before taking off.
summary
1. Contents of Newton’s first law:
2. Inertia: The property of an object to maintain a state of motion is called inertia.
All objects have inertia under any circumstances, and inertia is an inherent property of the object.
All objects under any circumstances: whether they are subject to force, whether they are moving, how fast they are moving, and whether they are moving at a uniform speed.
3. Inertia phenomenon and explanation
The difference between inertia and Newton's first law of motion.
Inertia: the property of an object. Without any conditions, all objects have inertia.
Law of inertia: The law of motion of an object without force.
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"Newton's First Law of Inertia" Force and Motion PPT Courseware 2:
"Newton's First Law of Inertia" Force and Motion PPT Courseware 2 Who do you think is right? The first point of view: When riding a scooter, if the person does not step on the ground, the scooter will eventually stop. Explain that force is required to maintain the motion of objects. The second point of view: When the scooter is sliding, people are not stepping on the ground, and the scooter...
"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...