Transcript Newton`s Second Law

Chapter 12
Section 2
Newton’s 1st and 2nd Laws
of Motion
Newton’s First Law:
An object at rest remains at rest, and an object in
motion remains in motion with the same speed and
direction (maintains its velocity) unless it experiences
an unbalanced force.
Example: A soccer ball resting on the grass remains
motionless until a force is applied (a kick). The kicked
ball rolls until the force of friction between the ball
and the grass acts on the ball and slows it.
Newton’s Second Law:
The unbalanced force acting on an object equals the
object’s mass time its acceleration.
(mass must be in kg to put into formulas)
Mass and Weight
Mass - the measure of the inertia of an object
Weight - a measure of the force of gravity acting on
an object
Notice!
the formula is basically Newton’s second law, except
weight (W) is substituted for force (F) and
acceleration due to gravity (g) is substituted for
acceleration (a).