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Conceptual Physics - Chapter 4: Newton's First Law of Motion - Inertia

A flash card set for chapter 3 of Conceptual Physics by Hewitt
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What causes changes in motion?
Forces
According to Aristotle, what were the two types of motion?
Natural motion and violent motion.
Natural motion
Originally thought to caused by objects seeking to find their natural resting place and not caused by forces.
Violent Motion
Imposed motion caused by forces that pushed or pulled. An external supplied force was apparent.
What did Copernius state about Earth's motion?
The simplest way to interpret astronomical observations was to assume that Earth and the other planets move around the sun.
Friction
The force that acts between materials that touch as they move past each other.
According to Galileo, when is a force needed to keep an object moving?
Galileo argued that only when friction is present - as it usually is - is a force needed to keep an object moving.
Inertia
The property of a body to resist changes to its state of motion.
Newton's First Law - Law of Inertia
Every object continues in a state of rest, of of uniform speed in a straight line, unless acted on by a nonzero net force.
Mass
The quantity of matter in an object. It is neither volume nor weight.
Weight
The force of gravity on an object.
Kilograms
The fundamental measurement of the mass of an object.
Newton
SI unit of force. 1 kg weighs 10 N
What is the relationship between mass and inertia?
The more mass an object has, the greater its inertia and the more force it takes to change its state of motion.
How does the law of inertia apply to objects in motion?
The law of inertia states that objects in motion remain in motion if no unbalance forces act on them.