Download Newton`s Laws of Motion

Newton’s Laws of Motion
The Man Behind the Laws

His mom wanted him to be a farmer.
 He was motivated at school by trying to be
smarter than a bully.
 His college closed for a while because of the
plague, and, while on break, discovered and
wrote the law of gravity.
 He discovered calculus and even invented
the reflective telescope (he’d also stare at the
sun until he would lose his vision).
 There really was an apple tree—but the apple
probably didn’t hit him in the head. He
wondered why the apple always fell in a
straight line and applied the idea to the moon
The 3 Laws

The law of inertia
 The law of
acceleration
 The law of equal
and opposite forces

The laws are
universal.

Apply to planets and
peas
First Law: The law of inertia

An object at rest
remains at rest, and
an object in motion
remains in motion at
a constant speed
and in a straight line
unless acted on by
an unbalanced force
 Friction is an
unbalanced force
 Inertia means
resisting change in
motion
Second Law: The law of acceleration

The acceleration of an
object depends on the
object’s mass and the
force applied to it

A=f/m

Explains why objects
fall with same
acceleration (10N=1kg)
F=ma
Third Law: Equal and
Opposite

Whenever one object
exerts a force on a
second object, the
second object exerts an
equal and opposite
force on the first

Forces act in pairs

Action and reaction
forces act on different
objects
The Laws at Work