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Galileo Galilei changed the way people understood motion after studying, and analyzing the root projectiles took. Galilei determine that the projectile took a parabolic root and not a straight line root. Before proving this, people used to think that projectiles were pushed along by an external force that was transmitted through the air. This force is known as “impetus”. They thought this force made the object move in a straight line until it fell straight to the ground.

Galileo Galilei theory: A projectile which is carried by a uniform horizontal motion compounded with a naturally accelerated vertical motion describes a path which is a semi-parabola.

Galileo studied for a long time projectiles, and determine they took a curve down thanks to gravity. People couldn't see this before because the projectiles they used to have fired in a short distance and the shorter the distance, the more unclear the curve is. Galilei study cannons being used in wars making the study of projectile motion more important.

Galileo used an inclined plane to prove the deory about the curve in the projectiles movement. Galileo did experiments on uniformly accelerated motion, and thanks to does studies he used the same apparatus to study the projectile motion. He started by using an inclined plane on a table and included a curved piece at the bottom which deflected an inked bronze ball into a horizontal direction. After some attempts, the ball accelerated rolled over the table-top with an uniform motion, and then fell off the edge of the table. Wherever it hit the floor, it would leave a small mark. Finally, thanks to that mark it would allowed the horizontal, and vertical distances traveled by the ball to be measured.

- was born in 1564 in Pisa, Italy- Galileo wanted to join the Church Order.- Parents: Vincenzo Galilei and Guilia Ammannati- University: Study medical doctor but then did mathematics- Universities: Padua and Pisa.

- A profesor arguing against traditional views of astronomy- He had the idea of a geocentric universe.- Inventor of the telescope- His ideas angered the Roman Catholic Church.- Died in his villa in 1642

Galileo Galilei

Isaac Newton

Law of Reciprocal Actions - If an object is pushed or pulled it will push or pull with the same force in the opposite directionDiscovery of Law of Gravitation - Newton thought that gravity was the force between two objects. He also believed that the large mass of the earth pulled objects towards it. He invented a formula for calculating the force of attraction between two bodies.

Law of Inertia - If an object is not being moved by an external force it will stay still or move in a straight line and at a steady speedLaw of Acceleration - How force acts on an object. The object accelerates in the direction the force is moving it. The formula showing this law is F=m*a, or the force acting on an object is equal to mass times acceleration.

The Principia (1st book) contains eight definitions and three axioms, the latter now known as Newton's laws of motion. Newton proceeds step by step with propositions, theorems, and problems.In Book II of the principia, Newton treats the Motion of bodies through resisting mediums as well as the motion of fluids themselves.

In Book III, titled System of the World, Newton extended his three laws of motion to the frame of the world, finally demonstrating 'that there is a power of gravity tending to all bodies, proportional to the several quantities of matter which they contain.'

Newton's law of universal gravitation states that F = G Mm/R2; that is, that all matter is mutually attracted with a force (F) proportional to the product of their masses (Mm) and inversely proportional to the square of distance (R2) between them. G is a constant whose value depends on the units used for mass and distance.It became the physical and intellectual foundation of the modern world view.

By:Luis Pablo, Zac Perren, Ramiro Aguirre, JP NiñoP.7



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