Tag: Sc10Crealmotionmoments

Constant Velocity and Acceleration

1. This first video relates to the constant velocity concept. Constant velocity is when an object moves at the same distance at every second. This means the speed and direction of velocity stay constant. I chose this animation of the planets because through their years there orbit stays the same moving around the sun at a consistant speed and regular direction.

Constant velocity is a vector meaning that along with magnitude (speed) is a direction that fully describes the quantity. the magnitude refers to how fast the object is moving (meters per second, kilometers per hour, and mph miles per hour). For direction, you use geographical directions (North, South, East, or West) and a positive sign or a negative sign (to represent up or to the right and down or to the left, respectively). The earth is moving 30 kilometers per second, or 67,000 miles per hour North.

 

2. The second video I have of a roller coaster relates to acceleration. Acceleration is when velocity changes and since velocity is a speed and a direction, there are only two ways for you to accelerate: change your speed or change your direction—or change both. A roller coaster relates to this because they slow down when going up a hill the cart goes slow but once it makes it over the hump it speeds up and does loops increasing and decreasing the speed.

 

If your changing your speed and not your direction then you are not accelerating. The force of gravity that pulls a roller coaster down hill causes the roller coaster to go faster and faster, it is accelerating. The force of gravity causes a roller coaster to go slower and slower when it climbs a hill, the roller coaster is decelerating or going slower.