Hello! This week we are learning about motion! Did you know
that you are never motionless? Even if you are extremely close to being
motionless, you aren’t. Sorry! That’s because you have your blood moving inside
of you. You’re even moving because the planet is revolving! So that means even
if you were dead, you would be in motion. And now that you are reading this,
that means your eyes are moving! You are always in motion! Weird, right? Well,
do you know what motion really is??
Motion is the process of being moved, in case you didn’t
know. I’ll give you an example! A simple one too! You are walking across the
street. You move from one side to another! You just used motion to cross the
street. Simple, right? One way motion can be measured is by relative motion.
Relative motion is when an object changes position moving relative to a
reference point. Here is an example. You are standing on the edge of a train
watching someone running towards you. It looks like they are running towards
you, and you are standing still. This is from your reference point. But, from
the other person’s reference point, they are running towards a moving train.
Here is an image of this!
You can also measure motion with distance and displacement.
Distance is the measurement of the path you take to get to the end. So, you are
driving to school. You drive 10 miles to get there. That is your path you took.
In real life though, it is only 7 miles away. From you house to your school,
the minimum distance is actually 7 miles. This is called displacement.
Displacement is the distance from the starting point to the finish. Another
example is in baseball. From one plate to the other, it is measured to be 90
feet. If you hit a single (you move to first place) your distance is 90 feet
and you displacement is 90 feet. But if you hit a home run, you distance would
be 360 feet, and you displacement would be zero feet. That is because your
starting and finishing point is in the exact same spot.
Next, we are learning about speed!
Speed is the distance an object travels in a unit of time. You could also just
say S=d/t, which is speed equals distance divided by time. So if you drove 500
miles in 10 hours, you speed would be 50 mph (miles per hour). Of course, those
10 hours took up a long amount of time. During those 10 hours of driving, you
obviously were not at the same consistent speed. Since you weren’t, the speed
would become the average speed. Average speed is the total distance traveled
divided by the total time taken. If it were measuring the speed at that moment,
then it would be considered instantaneous speed. So, 2 hours into the trip, I
was going 25 mph. That was my instantaneous speed for that moment, not the
whole trip. There you go! Now, you know about speed! Do you ever get it mixed
up with velocity?
Velocity is the speed of an object
and the direction of its motion. So for velocity, you need the speed and the
direction of the object. One time, I was at this Disney car ride thing where I
was riding in the car that was racing around a track. The tract is an oval,
like a usual one. The car was going 70 mph. It was going North originally, so that made it go 70 mph N. Easy, right? That's velocity for you!
Well, now that we are done
learning, I am going to randomly list some of the fastest animals on the
planet. Peregrine Falcon, Spine-tailed Swift, Frigate Bird, Spur-winged Goose,
Marlin, Cheetah, Pronghorn Antelope, Blue Wildebeest, and the Brown Hare are
the top ten fastest animals (according to this website). Well, that’s all for
today. Bye!
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| Cheetah |
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your feedback! I'd like to know how I did!
I would love to know what you thought of this!
Thanks for reading everyone! <3
xoxo Teemster! :D
