Who discovered the law of free fall? Who came up with the law of free fall

The discovery of the law of free fall was mainly made by the Italian physicist Galileo.

contribution. Before the seventeenth century, there were many ideas in physics that were wrong, such as Aristotle.

The concept of falling body Aristotle believed that in free fall motion.

In the early seventeenth century, the young Galileo, after reading Aristotle's writings, first used logical reasoning to sharply point out the logical contradiction in Aristotle's concept of free fall, he said, if two objects of different weights were connected by a rope, at what speed would they fall? According to Aristotle's theory of falling bodies, when connected, their weight is the sum of the weights of the two objects, so their falling speed should also be the sum of the velocities of the two objects when they fall separately On the other hand, the two objects connected by a rope are not one object after all, and the heavy object falls quickly and is dragged back by the light object, so the speed slows down; The light object originally fell slowly, and its speed should increase due to being dragged by the heavy object; Soon both objects will fall at the same velocity, which should be the average of the two objects as they fall separately.

These two very different conclusions are deduced from Aristotle's theory of falling bodies, which shows that Aristotle's concept of falling bodies is not credible and wrong.

Galileo overthrew Aristotle's doctrine that "the speed at which an object falls in proportion to its weight".

In 1590, Galileo Galilei did an experiment on the Leaning Tower of Pisa where "two iron balls hit the ground at the same time", and came to the conclusion that two iron balls of different weights fell at the same time, thus overturning Aristotle's theory that "the falling speed of an object is proportional to its weight", and correcting this erroneous conclusion that lasted for more than 1,900 years.

But this is unlikely, objects of different weights can only land at the same time under vacuum, and the law of free fall was proved when American astronaut David Scott tried to drop a feather and an iron hammer at the same height at the same height after landing on the moon, and found that they landed at the same time.

Even if Galileo did do this experiment, it was limited to the level of technology at the time, so it "seemed" to land at the same time. Regarding the free fall experiment, Galileo did a lot of experiments, he stood on top of the leaning tower and made objects of different materials fall from the top of the tower, and measured the difference in the time of falling.

It was found that all kinds of objects landed at the same time, in no particular order. In other words, the falling motion is not related to the specific characteristics of the object. Regardless of whether the ball is wooden or iron, if it starts falling from the tower at the same time, they will reach the ground at the same time.

Through repeated experiments, Galileo believed that the free fall velocity of light and heavy objects is the same, that is, the magnitude of gravitational acceleration is the same, regardless of air resistance.

The law of free fall was proposed by the Italian physicist Galileo Galilei in the 16th century.

The law of free fall is one of the fundamental laws in physics, which describes the law of motion of objects in free fall under the action of gravity. Through experiments and theoretical analysis, he discovered the laws of free fall motion, which laid the foundation for later physics research. Details are as follows:

1. Definition of free fall

Falling by a body refers to the motion of an object falling freely without any resistance under the force of gravity. In free fall, the velocity of the object will continue to increase, and the acceleration will be constant, and this acceleration is the acceleration of gravity, which is usually expressed by g, and its magnitude is about meters and seconds.

Second, the content of the law of free fall

The law of free fall has three aspects:

1. The first law: the trajectory of a free fall is a parabola.

2. The second law: the acceleration of a free fall is constant, the magnitude is the gravitational acceleration g, and the direction is downward.

3. The third law: the velocity of a free falling body increases with time, and the velocity is proportional to time and has nothing to do with the mass of the object.

3. Application of the law of free fall

The law of free fall has a wide range of applications in physics, and here are a few common applications:

1. Calculate the velocity and displacement of the free fall

The law of free fall can be used to calculate the velocity and displacement of an object in free fall motion. According to the law of free fall, the velocity of an object is proportional to time and the displacement is proportional to the square of time, so the velocity of an object can be calculated by measuring time and displacement.

2. Calculate the acceleration of a free fall

The law of free fall can be used to calculate the acceleration of an object in the motion of a falling body. According to the law of free fall, the acceleration of an object is constant and the magnitude is the acceleration g of gravity, so the acceleration of an object can be calculated by measuring the velocity and time of the object.

3. Study the motion of objects

The law of free fall can be used to study the laws of motion of objects. Through experimental and theoretical analysis, it is possible to derive the laws of motion of objects in free fall, so as to better understand other laws and principles in physics.

4. It is applied to engineering design

The law of free fall can be applied to engineering design. For example, when designing tall buildings, the effects of free fall need to be considered to ensure the structure and safety of the building.

The concept of free fall was first proposed by Galileo Galilei.

Galileo Galilei was a famous Italian physicist, mathematician, and astronomer who lived in the late 16th and early 17th centuries. Through experiments and observations, he came up with many important principles and theories of physics, including the study of free fall.

Galileo's study of free fall was based on his observations and reasoning. He argues that when two objects with different masses fall freely at the same time, they will fall with the same acceleration without taking into account air resistance, regardless of the object's coarse mass. This view was contrary to the prevailing doctrine of Aristotle, who believed that the speed at which an object falls is proportional to its weight.

Through this observation and reasoning, Galileo proposed the principle of free fall, laying the foundations of kinematics in modern physics. Or Changliang Galileo's research laid the foundation for the later establishment of Newton's laws of mechanics and had a profound impact on the development of modern science.

2) Free fall movement.

1.Muzzle velocity vo 0 2End velocity vt gt 3Drop height h gt2 2 (calculated from VO position downwards) 4Inference VT2 2GH

Note: (1) The free fall motion is a uniform acceleration linear motion with zero initial velocity, which follows the law of uniform linear motion with variable speed;

2) a g gravitational acceleration is smaller near the equator and smaller than flat land in high mountains, in a vertical downward direction).

3) Vertical upward throwing movement.

1.Displacement s good to check VOT-GT2 2 2End velocity vt vo-gt (g=

3.Useful inferences vt2-vo2 -2gs 4The maximum height of the rise hm car collapse VO2 2G (from the throwing point).

5.Round-trip time t 2vo g (the time from the throw to the original position).

Note: (1) The whole process of processing: it is a uniform deceleration linear motion, with the upward direction as the positive direction, and the acceleration is negative;

2) Segmented treatment: upward is a uniform deceleration linear motion, downward is a free fall motion, with symmetry;

3) The process of ascent and fall is symmetrical, such as the equivalent reversal of velocity at the same point.

Free fall formula: initial velocity vo = 0, final velocity v = gt, fall height h = 1 2gt. Free fall refers to the motion of a conventional object with zero initial velocity only under the action of gravity, which is called free fall motion.

Free fall formula: initial velocity vo = 0, final velocity v = gt, fall height h = 1 2gt. The free fall accomplice refers to the movement of the conventional body only under the action of gravity, and the initial velocity is zero, which is called the movement of the falling body from this time.