Speed & Velocity:

Objectives:

1. Define motion and Speed.

2. Calculate speed using the formula s = d/t.

3. Distinguish between constant, instantaneous, and average speed.

4. Represent speed graphically as d/t.

5. Distinguish between speed and velocity.

Key Terms:

average speed instantaneous speed speed velocity rate

Web Resources:

www.glenbrook.k12.il.us/gbssci/phys/Class/1DKin/U1b.html

www.glenbrook.k12.il.us/gbssci/phys/Class/1DKin/U1L1c.html

www.hyper-former.com/physics1/syllabus.htm (check out vectors and speed)

Notes:

Speed: (d/t)

Speed is simply the distance an object has traveled divided by the time it took to get there. It is the measure of how fast something is going.

- It is a scalar quantity in that no direction is required.
- The speed of an object traveling at that a specific point in time is known as instantaneous speed.
- The total distance traveled per (divided by) the total time is known as average speed.
- Any units are acceptable for speed. (mi/h, km/h, m/s, etc.)

Velocity:

Velocity can simply be stated as speed with direction.

- It is a vector quantity in that it must have direction. (10km/s N)
- An object with constant velocity must be traveling in a straight line.
- If either the speed of the direction changes, an object cannot be moving at constant velocity.

Think about this.

While on the track team you run the 400m, on an oval track, in 50 seconds.