Describing+and+Measuring+Motion

 ​ Describing and Measuring Motion, By Dillon  ("Man in Motion") In reference to the sidewalk, this cycleist is in motion.

Describing Motion


 * ​ Reference Points/Relative Motion -** A reference point is a place or a thing used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Stationary objects make better reference points, you probroblay know what happens when you use a moving object, you might not be moving at all but because your refernce point is moving you are in motion. So you could be in motion right now, it all depends on your reference point. If the sun is our reference point, then we are all in motion. As a matter of fact, relitive to the Sun, everything on Earth is in motion, because the Earth is in orbit around it. Thats whats known as relative motion.


 * Measuring Distance -** Scientists around the world use the International System of Units to prevent confusion of measurements. For instance the I.S.U. unit for distance is the meter,there are 100 cm in a meter, and 1000 meters make a kilometers. However, there are equations to convert meausrements.


 * The Speed Equation** is a an important yet basic and simple part of calculating speed. The equation is speed = distance DIVIDED by time. This is how they calculate speed, like Miles Per Hour. Speed is the amount of distance over an elapsed time.


 * Average Speed** is the TOTAL distance DIVIDED by TOTAL time. So say one 1/2 of a mile you went 10 mph. The other 1/2 you went 20. If you pluged this in the speed and distance into the equation, you would have average speed.


 * Instantaneous Speed** is the rate at which an object is moving at any given instant time. If you went 10 mph for 1/2 of a mile and 20 mph the other (again), you would have two instantaneous speeds.

("Speedometer")

Describing Veolcity,

The speed of an object isn't all of what motion is, direction matters to. When you know the speed, and direction of an object's motion, you know the **velocity**. Veolicity is very important with people who work with airplanes. You could imagine why, direction is important while landing and taking off, so is speed.

("Velocity of a Falling Penny" )

Graphing Motion,

​ You can show the motion of an object on a line graph in which you plot distance verses time. However, your graph might be a bit different if you decide to plot slope. Slope is rise over run, or a verticle difference between any two points. Slopes are everywhere, and most moving objects don't travel at an exact constant speed. A graph could look like a staircase because of this.

("Rise over Run")

​ Newton's Three Laws of Motion,


 * Isaac Newton** was born in England back in December 25, 1643. He lived to be one of the greatest mathematicians and scientist known to man. He lived to be eighty-five years old. But before he died, he discoverd ther three laws of motion. Sir Issac Newton was famos for this. On Earth, because of gravity and friction and air resistance, in may not seem like these facts make any sence.


 * The First Law** (also known as inertia) states that an object with no motion will stay without any motion unless it is acted upon an unbalenced force. And an object in motion will stay in motion and keep its velocity unless acted on by an unbalenced force.


 * The Second Law** states that an object will accelerate if acted on by a force, the greater the mass of the object, the stronger the force must be to make it accelerate. A way to find out how strong a force is by multiplying the mass of the object by the acceleration of the object.


 * The Third Law** for every force acted in one direction the is an equal force exerted in the oppisite direction.

(On Earth, because of gravity and friction and air resistance, in may not seem like these facts make any sence)

("Third Law of Motion")

Thanks for reading! Created by Dillon Works Cited

"Man in Motion." Man in Motion. Web. 17 May 2010. <[]>. "Speedometer." Speed. Web. 17 May 2010. <[]>. "Velocity of a Falling Penny." Velocity. Web. 17 May 2010. <[]>. "Rise over Run." Rise over Run. Web. 17 May 2010. <[]>. "Third Law of Motion." //BlogSpot//. Web. 20 May 2010. . Alimena, Diane. Prentice Hall Science Explorer, Describing and Measuring Motion. Motion, Forces, and Energy. Boston, Massachusetts: Pearson, 2008. 7-15. Print. "World Book ." //Motion//. M-13. 13. 233 North Michigan Avenue Chigago: World Bok Inc., 2007. Print. "U-X-L Encycloppedia of Science." //Laws Of Motion//. G-L. 5. 2005. Print.
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