Vocabulary Speed: the ratio of the distance an object

moves to the amount of time the object moves Velocity: the speed and direction an object is

moving, measured relative to a reference point Average speed: the total distance traveled

divided by the time it takes to travel that distance

Instantaneous speed: the rate at which an object is moving at a given moment

Unit II: Fast and Furious

Speed & Velocity

S8P3. Students will investigate relationship between force, mass, and the motion of objects.

a. Determine the relationship between velocity and acceleration. (DOK 2)

GA Standard

It is a rate! What does that

mean? A change over time.

What is the change? Change in position,

in other words, distance.

Standard unit: meters per second (m/s)

Speed

Instantaneous –rate at a given moment in time

Example: speedometer in a car

Speed – 2 types

Average speed – rate for the duration of an entire trip

This can be calculated…ready for the equation?

v = d/t v – velocity d – distance t – time What units do we

use? Try the practice

problems.

Calculation

1. A train travels 190 km in 3.0 hours and then 120 km in 2.0 hours.

2. A car travels 85 km from Town A to Town B, then 45 km to Town C. The entire trip took 1.5 hours.

Identify the Variables

What makes velocity different?

It is a vector! It is essentially

speed (magnitude) and direction

3 ways to change velocity:◦ Change in speed◦ Change in direction◦ Change in both

Velocity

Velocity is demonstrated on a distance vs. time graph

The slope of the line demonstrates speed/velocity

The steeper the slope, the higher the speed

Graphing Velocity

Explain how speed is considered a rate.

How does velocity differ from speed?

What shows the speed on a distance-time graph?

Recap