Unit 1-3 Summary

In unit 1, we learned about accuracy and precision. Accuracy is nearness of a measurement to the standard or true value. Precision several measurements provide an answer very close to each other. We got to use pendulums. We learned that the time it takes for one complete cycle to occur on a pendulum is cycle. We had to use independent variables (variable that changes the dependent variable) and the dependent variable (dependent on the independent variable).

In unit 2, we went over kinematics. Kinematics is the study of motion. The important question about motion was "Relative to what?" When someone says something is moving, it is moving relative to them, but to the car the person looking at the car seems to be moving back. Movement is relative to who is viewing the movement. We learned scalar and vector. A scalar is a quantity that has magnitude. Magnitude is best described as muchness of something. A vector is a quantity that has direction and magnitude. For vectors, we talked about displacement. Displacement is the amount of distance from the starting point. We next talked about graphes. We learned potion vs. time graph and velocity vs time graph. We reviewed three important rules:

1. Th slope of a potion vs. time graph is velocity.

2. The slope of a velocity vs. time graph is acceleration.

3. The area under the "curve" of a velocity vs. time graph is distance travelled.

Acceleration is a change of velocity per unit of time.

In this picture, I am flying in a plane. People who look up see I am moving fast. For me, it looks like they are moving backwards. It is all relative to who is looking at what.

In unit 3, we learned about acceleration. We learned about an acceleration vs. time graph. We also learned three equations to help solve for missing variable like time, distance, speed, and acceleration. There equations are:

Equations:                  A.K.A

D= 1/2at^2 + v0t        (d,a,t)

V= Vo + at                  (v,a,t)

V^2= Vo^2 + 2ad       (v,a,d)
We also talked about when you throw an item in the air, it has different speed. The object starts fast and slowly accelerates in the opposite direction. At a certain point in the air, it will stop for a second and start to accelerate downward. Then eventually gain a lot of speed.

This was a brief summary on what we have learned in the last three units.