october 29, 2012. the fancy science definition: an object will remain at rest or move in a straight...
TRANSCRIPT
NEWTON’S FIRST LAW
The fancy science definition:
An object will remain at rest or move in a straight line at a constant speed unless it is acted upon by a force
I wish gravity would stop
pulling my hair down.
NEWTON’S FIRST LAW (MADE EASY!)
Part A)Your object isn’t going to move unless you (or something else) gives it some force to make it move
Part B) If your object is moving, it will keep moving in a straight line at the same speed unless something causes it to change that speed
ENERGY…
Comes from the Greek word for activity Cannot be created or destroyed
Neither can mass…that is why those chemical equations need to be balanced!
Measured in Joules (J) You may be familiar with kilowatt-hours and
kilocalories (both types of energy) Can be transformed into different types of
energy What types of energy can we think of?????
SO MUCH ENERGY!!!!
Types of energy:Thermal MagneticChemical ElasticElectrical SoundElectromagnetic (sun)MechanicalNuclear Luminous (light)
AND OUR MOST POPULAR…
Potential Energy: Energy that is stored
due to its position Not moving
Kinetic Energy: Energy that is has
due to its motion Any kind of moving
FORCE
Definition: a push or pullMeasure force in Newtons (N)Math Plug n Chug: Force = mass x acceleration
A force has: A size and direction
BALANCED AND UNBALANCED FORCES Balanced Forces
Equal and opposite forces The object won’t move
Unbalanced Forces If one force is bigger than the other, the
box will move in the direction of the bigger force
In other words, if the object is moving, the forces are unbalanced
CONTACT FORCE AND LONG RANGE FORCE Contact force
When two objects are physically touching If you push your book with your finger and it moves
in the direction you push it, this is a contact force
Long Range Force Looks like nothing is touching it, but a force is
moving it If you drop a ball, gravity is acting on the ball…but
it looks as if nothing is physically touching the ball
GRAVITY
The bigger the object, the more gravity is has More mass = more gravity
Gives weight to objects Your weight is the measurement of gravity
pulling down on you If we were on the moon, you’d weigh less
because the moon is smaller than the Earth.
WHERE WOULD YOU HAVE MORE WEIGHT?
http://www.daviddarling.info/images/Jupiter_and_Earth_compared.jpg
INERTIA
An object’s ability to stay at rest or keep moving with a constant velocity (velocity is speed with a direction)
Example: 35 m/s North
Depends on the object’s mass A lot of mass = a lot of inertia A little bit of mass = not a lot of inertia