Newton's First and Second Laws (The First Law of Motion (Inertia (If…
Newton's First and Second Laws
An object does not need force once it is in motion, suggested Galileo Galilei in 1600s
An object only needs force to change directions
Galileo lead the way for Newton and Newton proposed the tree laws in the late 1600s
The First Law of Motion
The first law restates Galileo's ideas of motion and force
" Newton's first law of motion states that an object at rest will remain at rest, and an object moving at a constant velocity will continue moving with a constant velocity, unless it is acted upon by an unbalanced force."
If an object is not moving then it will not move until a force moves it.
If an object is moving it will keep moving at a constant velocity until a force changes it's speed of direction.
"On Earth, gravity and friction are unbalanced forces that often change an objects motion.
If an object is moving or if it is still it resits the change in motion which is called inertia.
Newtons first law is called inertia
"A force, such as a pull of a seat belt, is required to change your motion."
Inertia Depends on Mass
Some objects have more inertia than others.
"The greater the mass of an object is, the greater its inertia, and the greater the force required to change its motion."
The Second Law of Motion
"According to Newton's second law of motion, acceleration depends on the object's mass and on the net force acting on the object."
Acceleration = Net Force/Mass
Acceleration is measured in meters per second per second, and mass is measured in kilograms.
Newton's second law is, force is measured in kilograms times meters per second per second, N for short.
Changes is Force and Mass
A way to increase acceleration is to change the mass
In the equation, acceleration and the mass change in opposite ways.
"If the force is constent, an increase in mass causes a decrease in acceleration. Opposite is: A decease in mass causes an increase in acceleration with a constant force."