What is speed?

Acceleration

Velocity

A change in speed or direction

Example:

Speed with direction

Example:

The circumference of the Earth at the equator is 25,000 miles. The Earth rotates in about 24 hours. Therefore, if you were to hang above the surface of the Earth at the equator without moving, you would see 25,000 miles pass by in 24 hours, at a speed of 25000/24 or just over 1000 miles per hour.

Earth is also moving around the Sun at about 67,000 miles per hour.

Relative motion

How fast are you moving right now?

Speed is the rate of change in distance over time.

s=d/t

Example:

What is speed?

Let's look at a

couple examples-

Mrs. Miller runs a half marathon in 2 hours. Mrs. Jones runs a half marathon in 2 hours and 20 minutes.

How much faster is Mrs. Miller?

Motion