PHYSCI L3 Law of Motion (Aristotlean vs. Galilean)

Motion

is the ACTION OF CHANGING LOCATION OR POSITION

First evidence of the study of motion of heavenly bodies can be TRACED BACK to the people of SUMERIA AND EGYPT

ARISTOTLE'S VERTICAL MOTION

Vertical motion is referred to as NATURAL MOTION. In a natural motion, THE OBJECT WILL MOVE AND WILL RETURN TO ITS NATURAL STATE based on the object's material or composition- earth, water, air, and fire.

ARISTOTLE'S HORIZONTAL MOTION

Aristotle classified any motion that REQUIRED A FORCE as a "VIOLENT MOTION".

A moving object in a violent motion REQUIRES a PUSH OR PULL to maintain horizontal motion.

ARISTOTLE'S PROJECTILE MOTION

Aristotle believed that the of an object is PARALLEL TO THE GROUND UNTIL IT IS THE OBJECT'S TIME TO FALL BACK INTO THE GROUND.

He viewed ____ as NATURAL and VIOLENT motion.

Initial motive force transfers to the medium initially surrounding the object, a "POWER" to act as a motive force. (force is transferred to the medium)

Medium is then imparted with the "Power" to act.

GALILEO'S VERTICAL MOTION

In the absence of a resistance, objects would fall NOT DEPENDING ON THEIR
WEIGHT but in the TIME OF
FALL.

If the object ENCOUNTERED A RESISTIVE FORCE from a fluid EQUAL OR GREATER than its weight, it will SLOW DOWN AND REACH THE BOTTOM.

GALILEO'S HORIZONTAL MOTION

An object in motion, if unimpeded (UNDISTURBED), WILL CONTINUE TO BE IN MOTION, and an external force is NOT NECESSARY to maintain the motion.

GALILEO'S PROJECTILE MOTION

Galileo performed experiments on uniformly accelerated motion using an inclined plane, and used the same apparatus to study _.

Galileo was credited for quantifying the "rate of fall" by measurement of distance and time and plotting it
graphically.

TWO INDEPENDENT MOTIONS
•Horizontally
•Vertically
= Parabolic Path

2 INDEPENDENT MOTIONS

HORIZONTALLY - It moves forward at a constant speed because there is no horizontal
acceleration.

VERTICALLY - It moves upward first, slows down,

PARABOLIC PATH - the combination of these two
motions - with a constant horizontal speed and accelerated vertical fall - makes the ball follow a CURVED, parabolic path, as seen in the picture.

Isaac Newton

Developed laws of motion and
gravitation.

3 laws of motion

1st law (LAW OF INERTIA): A body in motion remains in motion or a body at rest remains at rest, unless acted upon by a force.

2nd law (LAW OF ACCELERATION): Force equals mass times acceleration: F = m*a

3rd law (ACTION AND REACTION): For every action, there is an equal and opposite reaction.