Download Chapter 11 Forces - Mr. Meyers Class

11-1 Laws of Motion
 Sir Isaac Newton –
described the
relationship between
motion and force
 Newton - sitting under
an apple tree, an apple
fell on his head, and he
suddenly thought of
the Universal Law of
Gravitation.
 Newton - sitting under an
apple tree, an apple fell on
his head, and he suddenly
thought of the Universal
Law of Gravitation.
 Force – measured in
Newtons (N)
 Newton’s 1st Law –
 An object as rest will
remain at rest and an
object in motion will
stay in motion unless
acted on by an outside
force.
 Also called the law of
inertia
 Inertia – Tendency of
an object to resist a
change in motion
 Law of Inertia – Mass
and Inertia are directly
related
 The More mass the
More inertia
 The less mass the less
inertia
 The amount of force
acting on an object
equals the object’s mass
times its acceleration.
 Force = Mass x
Acceleration
 F=MxA
 A=F/M
 M=A/F
 Newton (N) – Unit of
measurement for Force
 1 Newton = 1 kg x 1 m/s²
 If you throw a softball
and a baseball as hard as
you can, why don’t they
have the same speed?
 What is the acceleration of a boy on a skateboard if the
unbalanced forward force on the boy is 15 N? The total
mass of the boy and the skateboard is 58 kg.
 What force is necessary to accelerate a 1250 kg car at a
rate of 40 m/s2?
 What is the mass of an object if a force of 34 N
produces an acceleration of 4 m/s2?