Physics #1

For the first post on the physics unit, I'm going to write down all of the key words for chapter 8 and chapter 9

Acceleration: the rate at which an object changes it's velocity

Acceleration Due To Gravity:...in the absence of gravity; the value of acceleration due to gravity near the surface of the Earth is approximately 9.8 m/s2 downward

Air Resistance: a friction-like force that opposes the motion of objects that move through the air.

Average Acceleration: average rate at which an object changes it's veloctiy shown by the slope of a velocity-time graph.

Average Velocity: the rate of change in position for a time interval.

Change In Velocity: change the occurs when the speed, the direction, or both of an object calculated by subtracting the initial velocity from the final velocity.

Constant Acceleration: velocity changing at a constant rate

Deceleration: acceleration that is opposite to the direction of motion; a decrease in speed.

Displacement: the straight line distance and direction from one point to another.

Distance: a scalar quantity that describes the length of a path between two points or location.

Gravity: attractive force between two or more masses

Position: a vector quantity that describes a specific point relative to a reference point.

Position-time graph: a graph of an objects position during corresponding time intervals.

Scalars: quantities that only have magnitude.

Slope: the direction of a line on a graph.

Uniform Motion: traveling in equal displacement in equal time intervals.

Vectors: quantities that have both magnitude and direction

Velocity: the displacement of an object during a time interval divided by the time interval


If I didn't know what these words meant, I wouldn't have been able to understand the unit...at all. But I do, so I did.