Chapter 2: describing motion- kinematics in one dimensions

Kinematics

The descriptions of how objects move with respect to a defined reference frame

Displacement

The change in position of an object(how far the object is from its starting point, regardless of how it got there)

Average speed

The distance traveled divided by the time it took

Average velocity

The displacement divided by the time

Instantaneous velocity

The limit as the time becomes infinitesimally short

Any measurement of position, distance, or speed must be made with…

Respect to a reference frame

speed

How far an object travels in a given time interval

velocity

Defined in terms of displacement instead of total distance

Acceleration

The rate of change of velocity

Acceleration is..

A vector

Negative acceleration

Acceleration in the negative directions as defined by a the coordinate system

Deceleration

Occurs when the acceleration is opposite in direction to the velocity

In the absence of air resistance, all objects..

Fall with the same acceleration

Displacement has both what?

Magnitude and direction

Vectors

Quantity with magnitude and direction