Transcript Newton`s First Law

Do Now:
Newton’s Laws of Motion
Essential Question: Newton established his three
Laws of motion to do what?
Newton’s First Law of Motion
• Definition: An object in motion stays in
motion, or an object at rest stays at rest until
an unbalanced net force acts on it.
• Under these conditions the first law says that
if an object is not pushed or pulled upon, its
velocity will naturally remain constant. This
means that if an object is moving along,
untouched by a force of any kind, it will
continue to move along in a perfectly straight
line at a constant speed.
Newton’s First Law of Motion
Continued….
• The first law also means that if an object is
standing still and is not contacted by any
forces, it will continue to remain motionless.
Actually, a motionless object is just a special
case of an object that is maintaining constant
velocity. Its velocity is constantly 0 m/s.
If the velocity is not changing is there
an acceleration?
• Turn to elbow buddy and discuss.
What is Inertia?
• Write down something in your notebook.
Inertia
• Definition: Tendency of an object to resist any
change in its motion.
Video Questions?
• Does weight and mass mean the same thing?
• What causes an object to move when its at
rest?
Do Now:
Newton’s
Second Law
If I was an object traveling at a
constant velocity what would my
acceleration be?
If an object has a velocity of 0 m/s
what would its acceleration be?
Newton’s Second Law
• Definition: A net
force acting on an
object causes the
object to
accelerate in the
direction of the
force.
Question for discussion
• If an object has a mass and there is an
acceleration what can we calculate?
Newton’s Second Law Continued…
• Acceleration is
determined by
the size of force
and the mass of
an object.
How to calculate Force
Questions for Video
• Which ball was the lightest? Yellow or red?
• Which ball traveled the furthest the fastest?
• It takes less force to move something that is
___________________?
Do Now:
Behavior Expectations Today:
• We will not talk without raising our hand.
• We will participate in all activities and be on
task.
• We will be respectful to everyone.
Force Problem #1
• An Elephant has a mass of 5 kg and an
acceleration of 2 m/s/s. What is the force on
the object?
Force Problem #2
• An object has a mass of 15.89 kg and an
acceleration of 17.18 m/s/s. What is the force
on the object?
Force Problem #3
• Ms. Alvarez has an object that’s force is 50N
and it has an acceleration of 10m/s2, what is
the mass of the object?
Work with Partner or Alone!
Do Now:
Newton’s Third Law
• Definition: For every action (or force), there is an
equal and opposite reaction (or force).
• For example, if you push on a wall, it will push back
on you as hard as you are pushing on it.
What is Momentum?
• Write something in your notebook. Just
Guess!
Momentum
• Definition:
Property or
tendency of
moving objects
to keep moving
resulting from its
mass and
velocity.
How to calculate Momentum (p)
Momentum Problem #1
• A particle has a mass of 10 kg and a velocity of
5 m/s. What is the momentum of the particle?
Momentum Problem #2
• A particle has a momentum of 10 kg/m/s and
a velocity of 5 m/s. What is the Mass of the
particle?