Download File - Miss Hinze`s Class

What to do…
Turn in any late or missing work.
If you did not turn in your Newton’s 1st Law Drawing,
turn it in now!
In your journal, write Newton’s 1st Law in your OWN
words and write and example.
Newton’s Second Law
Objective: Describe and apply real world
examples of Newton’s 3 laws.
Newton’s 2nd Law of Motion
The acceleration of an object is equal to the net force
exerted on the object divided by the object’s mass.
Force = Mass x Acceleration
Force
Acceleration = Mass
The acceleration due to gravity on earth = 9.8 m/s2
Three Forms of Newton’s 2nd Law
If you want to find…
Acceleration (a)
Net Force (F)
Mass (m)
And you know…
Net Force (F) and
mass (m)
Acceleration (a) and
mass (m)
Net Force (F) and
acceleration (a)
Then the formula you
would use is…
Units for solving for Newton’s 2nd Law
Identify the information you are given
◦ Look at the units
◦ Unit for Force – Newton (N)
⚫Remember: Weight is a force due to
gravity
◦ Unit for Acceleration – m/s2
◦ Unit for Mass – kg or g
An object at REST
Balanced Force
The force exerted by the HAND
is EQUAL to
THE FORCE OF GRAVITY
Unbalanced Force The
force exerted by gravity
is GREATER
than
air resistance.
An object in MOTION
Unbalanced forces cause objects to Accelerate
1. Increase Speed
2. Decrease Speed
3. Change Direction
Part I: Acceleration Depends on Mass
Acceleration decreases
as its mass increases
Acceleration increases
as mass decreases
Acceleration and mass are inversely related
Example: You are pushing a shopping cart at the grocery store. At
the beginning of your shopping trip, you exert a small force on the
cart to accelerate it. (smaller mass = greater acceleration)
Exert the same amount of force when the cart is full and the cart will
not accelerate as much. (greater mass = smaller acceleration)
Part II: Acceleration Depends on Force
Acceleration increases
as the force on it increases
Acceleration decreases
as the force on it decreases
Acceleration and force are directly related
Example: When pushing the full shopping cart, if you push
harder (greater force), the cart will move faster.
If you push the full shopping cart with less force, the
cart will move slower.
**The acceleration is always in the same direction
as the force applied. The
shopping cart moved forward because the push was in a forward direction
We know that objects
with different masses
accelerate to the ground
at the same rate.
However, because of the
2nd Law we know that
they don’t hit the
ground with the same
force.
F = ma
F = ma
98 N = 10 kg x 9.8 m/s/s
9.8 N = 1 kg x 9.8 m/s/s
Put it together. . .
Complete the skill sheet.
This will be turned in by the end of class
today.