Transcript Newton`s Laws

Monday, November 2, 2015
Unit
Question
What role do forces play in the world around us?
Guiding
Question /
Learning
Target
Warm-up
What are the Newton’s 3 Laws of Motion
Agenda
1. Newton’s 3 Law’s of Motion
2. Modern Marvels Car Crash and Newton
Practice
1. Quiz Friday
Homework
What is acceleration?
A change in velocity from slowing down,
speeding up, or changing direction.
Newton’s Laws of Motion
Newton’s 1st Law: Inertia
• An objects resistance to any change in
motion.
• Objects with greater mass have greater
inertia.
Newton’s Law of Inertia
• A body (object) at rest
will stay at at rest; a
body in motion will
stay in motion.
Inertia Examples:
Newton’s Second Law
• Force = mass x acceleration (F = m x a)
F=m
x
a
• Force, mass, and
acceleration are
all connected.
– For any object, the
greater the force
applied to it, the
greater its
acceleration will be.
Learning Checkpoint
• Calculate the force on an object that
has a mass of 12 kg and an
acceleration of 4 m/s/s.
F
• F = mx a
• F = 12 kg x 4 m/s/s
• F = 48 kg x m/s/s = 48 N
m
a
Learning Checkpoint
• What is the acceleration of a 200 kg
object with 3,000 N of net force acting
on it?
F
• a=F/m
m
• a = 3,000 kg x m/s/s / 200 kg
• a = 15 m/s/s
a
Newton’s Third Law
• To every action there is an equal and
opposite reaction.
– Remember: Action-Reaction Forces are
NOT the same as balanced or unbalanced
forces.
• Balanced or unbalanced forces act on the same
object, sometimes resulting in its motion.
• Action-Reaction forces act on two different
objects.
Learning Checkpoint
• When a force is exerted on a box, an
equal and opposite force is exerted by
the box. These forces are known as
action-reaction forces.
Examples: