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Newton’s First Law of Motion:Inertia
“An object remains at rest, or in uniform motion in a straight line, unless compelled to
change by an externally imposed force.”
Newton’s First Law of Motion
Objects want to continue doing what they are already doing: Objects at rest will stay at rest Objects in motion will continue in that motion
(constant speed and direction) Unless an outside force acts on the object.
In layman’s terms
Unless there is a force acting on the object, its velocity will not change.
Unless there is a force acting on the object, it will remain at rest
Still not sure?
No change in speed or direction = CONSTANT VELOCITY
Objects at rest = ZERO VELOCITY These values remain constant in the absence
of a force. NO FORCE = NO ACCELERATION (because
the velocity does not change)
Let’s Elaborate
Aristotle believed that a force was required to keep an object in motion.
Chair Example vs. Projectile Example
Newton and Galileo made the statement that no force is needed to keep an object moving, but will a force prevent it from moving?
And the Scientists?
Resistive Forces – Opposing motion
Friction and Air Resistance are the two common resistive forces
Frictional Forces
http://www.youtube.com/watch?v=A6snX4M2_8U&feature=bf_prev&list=PLURSuaQhTHRnOYXl8sQp1NIDZ36fGtH43
What is Inertia?
What is mass?
Let’s talk mass
We refer to Newton’s First Law as the Law of Inertia
This is the objects resistance to a change in its motion.
So we can define mass as a measure of an object’s inertia, the property that cause it to resist a change in its motion.
How is inertia related to mass?
http://www.youtube.com/watch?v=SIsl1TQEcCA&feature=bf_next&list=PLURSuaQhTHRnOYXl8sQp1NIDZ36fGtH43
Inertia and Mass
WOULD YOU RATHER?INERTIA STYLE
Try to move:
OR
Sumo Wrestle
OR
Try to catch
OR