Unit 1

Inertia/Newton’s 1st Law

• .An object at rest will stay at rest until a force is acted upon it
• The friction between the paper and cup isn't enough to make the cup move though the paper was snatched from under it
• Inertia is a property that states that an objects state of motion remains the same
• An object in motion will stay in motion unless a force is acted upon it to stop it
• An object with a lot of mass will also have a lot of inertia

Net force and Equilibrium

• Net Force is the total force being acted upon an object
• Force is a push or pull
• Force is measured in newtons, or N
• When net force equals 0, the object is at an equilibrium
• Equilibrium can occur at two different times
• When the object is at rest, and when the object is moving at a constant velocity
• When an object is at equilibrium, the forces canceled each other out
• I push 5N to the left and you push 5N to the right,
• Ex: I push 5N to the left and you push 10N to the right the net force on this object is 5N to the right

Velocity

• Speed and velocity are not the same thing
• Speed is how fast something is going at a certain rate
• Velocity is how fast something is going at a certain rate but it adds the magnitude direction
• An object can go at a consistent speed and not have a constant velocity because velocity has direction
• v=d/t
• When velocity is changing, the object is accelerating
• Arrows which are vectors can be used to show an objects direction and how big it is can show you how fast it is going
• Ex= Ike is goes 6 meters after 2 seconds. How fast is he going?
• 6m/2s= 3m/2
• 
  

Acceleration

• .Acceleration= ⌂v/t
• Acceleration is the rate at which something changed velocity
• If something has a constant velocity,it cannot have an acceleration
• If something is accelerating therefore, it cannot have a constant velocity
• The units for acceleration are m/s^2
• The rate of acceleration in free fall is equal to 9.8 m/s^2
• This is gravity and it is constant
• When you are driving on the highway and you start to speed up you are accelerating
• When you are on cruise control you are not

Using a graph

• When given distance and time an object was in motion, we can find out the acceleration as well as the velocity
• The y axis must have distance
• The x axis must have time or time^2
• If the time is 3 then time^2 equals 3*3=9
• When acceleration is constant
• The graph with time will be exponential 
• The graph with time squared will be linear
• This slope will be equal to the 1a/2 in d=(1a/2)t^2
• When velocity is constant
• The line will be linear
• The slope is equal to the velocity
• This is because v=d/t
• When you use a scatter plot for your data, you must make a best fit line
• It should be the median with all of your points and can give you a solid idea of where the line may be in later point
• The slope of the best fit line also tells you the correlation of your plot based on its sign