Unit One final post

Unit one all summed up

Major sections of the unit

1.      Inertia- Newton’s First law

     Newton’s first law states that an object in motion will stay in motion, and that an object at rest will stay at rest until acted on by an outside force. Inertia is the phenomenon of this law, so when a car slows down rapidly the force of that deceleration is in the car. If there is a cup of coffee in that car it will then spill not because a force knocked it over, but rather the lack of force on the coffee caused it to fall. Only the car is slowing down not the coffee so it will slam into the windshield. The windshield acts as an outside force to stop the coffee. This is called inertia. In simple terms it means that an object will keep doing what it’s already doing.

2.       Velocity-Acceleration

     Speed is not velocity; velocity is speed with a direction. There are two ways to change velocity, either change direction or accelerate forward or backward (changing speed). Acceleration is different than velocity due to acceleration is change in velocity.

Velocity is measured in meters per second

Acceleration is measured in meters per second per second or meters per second squared

3.      Net force- Equilibrium

     Net force is whenever the sum of all of the forces acting on an object is 0, this means that an object can be at rest with a net force of zero, or moving at a constant velocity do to the lack of forces pushing against it. A net force of 0 and equilibrium are interchangeable.

 

                                                50 N                                                         50 N

                                                50-50= 0 N – object is at equilibrium

4.      Equation of a line

     Y=M(X) +B is the equation of a line, and is identical to distance formula in constant velocity. It is also similar to the distance formula for constant acceleration, except for the slope being cut in half.

Y= Distance   - Dependent variable – occurs if dependent happens

X= time          -independent variable

M=slope         -is interchangeable with velocity

B= y intercept   -not as prominent in our class as we usually start at 0

Formulas

Constant Velocity	Constant Acceleration
How fast- v=d/t	How fast- v=a(t)
How far- d=v(t)	How far- d=1/2 a(t^2)

Video on graphing