# Do You Know the Basic Principles of Mechanics?

By: Annette

Some fundamentals of mechanics were discovered by scientists before the birth of Christ. These basic ideas continue to be the foundation of our understanding of how things move! Speaking of moving, your intelligence is about to get a run for its money.

# Mechanics is a branch of which science?

Mechanics is a branch of physics. It allows us to describe how things will move when subjected to force.

# What is the difference between mass and inertia?

Mass and inertia are the same. An inert object has no inclination to move - until a force is applied.

# What is the geocentric theory?

The geocentric theory claimed that Earth is motionless, and the center of the universe. This theory was created by Ptolemy.

# Who believed that Earth had separate rules of mechanics?

Aristotle falsely believed that Earth did not abide by the same principles of motion as other celestial bodies. This adversely affected the development of mechanics.

# Who pointed out Aristotle's errors in mechanics?

Copernicus pointed out that Aristotle's geocentric theory was wrong. Galileo then studied and popularized the new sun-centered model. He was one of the greatest scientific minds that world has ever know.

# What do you call the theory that the sun is the center of the world?

The heliocentric model replaced the geocentric model. It was described by Nicolaus Copernicus in "On the Revolutions of Heavenly Spheres."

# Who discovered that there is more than one solar system?

It was Giordano Bruno who took Copernicus' heliocentric theory one step further by noting that there are multiple universes. Our solar system is one of an infinite​ number of them!

# Which of these is credited to Galileo?

Both of these theories were put forth by Galileo Galilei. He introduced the pendulum theory in 1583 and the free-falling objects theory in 1602.

# Who created the three laws of planetary motion?

Johannes Kepler discovered the three laws of planetary motion. Among these is the discovery that planets move in elliptical orbits around the sun.

# Classical mechanics is ______ mechanics.

Newtonian mechanics are synonymous with classical mechanics. Newton's equations owe a lot to the Galilean Transformation, which is also a set of equations.

# According to Newton, time and _______ are independent​ of one another.

According to Newtonian mechanics, time and space are absolute attributes. They are fully independent of each other.

# Is force an absolute​ attribute of mechanics?

Force is not an absolute attribute, because it relates to mass and changes in that mass' velocity over time. Newton discovered this.

# Mechanics can also be described as the science of the motion of what?

Mechanics is the the science of the motion of bodies. Newton was primarily concerned with planets, but bodies are objects in general.

# To guess the motion of an object, mechanics makes use of what?

In mechanics, the use of models is fundamental. A model is presented as an image of a body, and it reflects all the relevant attributes of that object.

# Newton's laws allow us to make a mathematical model or equations of ______.

We are able to create equations of motion thanks to Newton's laws. That means we can predict how something is going to move.

# Can we make formulas for the movement of liquids and gases?

We can definitely create equations and models for the movement of liquids and gases. These are the mechanics of liquids.

# The mechanics of water are known as ______.

Hydraulics are the mechanics of incompressible fluids, such as water. We rely on hydraulics in our everyday lives.

# Which law includes the concept that a body at rest not acted upon by an external force will remain at rest?

This is Newton's 1st law of motion. A body at rest tends to stay at rest!

# Who said, “If I put pressure with a finger upon a stone with a certain force, then the stone also puts pressure upon my finger with the same force”?

This is a direct quote from Newton himself. His concept was based on force as a vector quantity.

# Who discovered the gravitational constant G?

Henry Cavendish discovered the gravitational constant G. This describes the gravitational field and is used in equations of motion.

# Who wrote "On the Equilibrium of Planes"?

Archimedes wrote "On the Equilibrium of Planes." The work explained how to determine the center of gravity of geometric shapes.

# Weight = body mass multiplied by what?

Weight of a body can be determined if you know a body's mass "m" and gravitational acceleration "g": W = mg. Mass described this way is gravitational mass.

# Newton's "Mathematical Principles of Natural Philosophy" was published when?

Newton's seminal work, where he defines the three laws of motion, was published in 1687. The laws were eventually modified from the original text.

# How many classes of force are there?

There are nine key classes of force. They include frictional force, tension force, air resistance force, gravitational force, electrical force, and more.

# Which is true, according to the special theory of relativity?

According to the special theory of relativity, the present, past and future are relative. Might as well throw your watch away, then?

# If several forces act upon a particle, net force is the ______ of these forces.

When many forces act upon an object, net force is determined by the sum of these forces. Net force is the combined force acting on an object.

# Who formulated the theory of relativity?

Albert Einstein formulated the theory of relativity in 1905. He introduces space-time as an invariant quantity. His theory was published in 1915.

# What is the name for a diagram indicating the forces acting on a body?

Free-body diagrams show the necessary data to know precisely how a body will move, given the forces acting upon it. This data is then inserted into an equation.

# What is statics?

Statics is a main subgroup of general mechanics. It is the study of force upon or within a body that is still, or in stasis.

# What is kinematics?

Kinematics, a sub-group within mechanics, is the prediction of a motion in a given situation. This is applied to one or multiple bodies.

# The theory of relativity deviated from classical mechanics to what degree?

The theory of relativity predicts deviations in motion from classical mechanics, but these are actually quite minor, and can only be observed by scientists using the proper techniques.

# Quantum mechanics deals with the behavior of what?

Quantum mechanics deals with the behavior of matter at the atomic or subatomic scale. This behavior could not be adequately explained by classic mechanics.

# Can engineers build bridges using classical mechanics?

Yes, engineers rely heavily upon classical mechanics. In fact, they wouldn't be able to do their job otherwise!

# Copernicus' “Six Books Concerning the Revolutions of the Heavenly Orbs” sparked what?

Copernicus' 1543 book sparked the Scientific Revolution. This culminated in Newton's "Principia" nearly 150 years later.

# Who used a telescope?

Galileo Galilei was able to use a telescope, since he built one in 1610. Some assume Galileo invented it, but it was actually Hans Lippershey, a Dutch eyeglass maker, in 1608.