Motion+1

Phenomenon – Seems like moving backwards when stationary or moving forward. Ball thrown from car looks like it is going straight but it is traveling at an angle.

How can you describe the motion of an asteroid or meteor? How much energy does an asteroid or meteor possess? How does gravity affect an asteroid or meteor? How does friction affect an asteroid or meteor?

Motion An object is in motion if its distance from another object is changing. How this motion is perceived depends on the reference point used. A reference point is a place used to compare the movement of objects and is often assumed to be stationary. How do you know if you are moving?

Relative Motion Whether you are moving or not depends on the reference point you use. Using one reference point like your chair will give one answer. Using the Sun as a reference point will give you another answer. Remember that the Earth is both rotating and revolving. Common reference points are a place on the Earth's surface, the center of the Earth, and the Sun. Motion is relative because it depends on the reference point being used.

How are you moving using your chair as a reference point? How are you moving using sunrise or sunset as a reference point? How are you moving using the Sun as a reference point? How are you moving using the center of the galaxy as a reference point?

The length of the path taken between two points is called __distance__. __Displacement__ is the length and direction that an object has moved from it starting point. These lengths can be the same of different. If the motion isn't in a straight line, distance is longer than displacement. When motion is in a straight line, distance and displacement are the same. For example the distance traveled to school is longer than how far the school is from where you slept. This because the motion to school isn't a straight line.

Draw a map of your route to school estimating the distances traveled between turns. Draw a straight line between the school and where you spent the night.

Distance and direction are both important for determining the motion or displacement of an object. The amount of displacement is called magnitude. In other words, the magnitude of displacement is the straight-line distance traveled. The direction of motion can be described using a vector. A quantity that consist of both a magnitude and direction is called a vector. Vectors can be shown using arrows. Magnitude is shown by the length of the arrow. Direction is shown by where the arrow is pointing. Vectors are a good way to indicate the magnitude and direction of motion.

Copy figure 3 on p. 341 remembering to include all the words.



https://www.space.com/51-asteroids-formation-discovery-and-exploration.html