Log out KINETIC power OF ASTEROID effects ON planet
Kinetic power (From The Sciences, 6th ed., by Trefil and Hazen)
Think around a cannonball flying with the air. Once it access time a wood target, the sphere exerts a pressure on the fibers in the wood, splintering and pushing lock apart and creating a hole. Work needs to be excellent to make that hole; fibers need to be moved aside, which means that a force must be exerted over the street they move. Once the cannonball hits the wood, the does work, and also so a cannonball in flight clearly has the capacity to execute work—that is, it has energy—because of its motion. This power of activity is what we contact kinetic energy.
You are watching: A baseball and a golf ball have the same momentum. which has the greater kinetic energy?
You deserve to find countless examples that kinetic energy in nature. A whale relocating through water, a bird flying, and also a predator catching its food all have kinetic energy. So do a speeding car, a flying Frisbee, a fall leaf, and anything else that is moving.
Our intuition tells us that two factors govern the amount of kinetic energy contained in any type of moving object. First, heavier objects the are moving have more kinetic energy than lighter ones: a bowling round traveling 10 m/s (a an extremely fast sprint) dead a lot much more kinetic energy than a golf ball traveling at the exact same speed. In fact, kinetic energy is straight proportional to mass: if you double the mass, climate you dual the kinetic energy.
Second, the quicker something is moving, the better the pressure it is capable of exerting and the greater energy it possesses. A high-speed collision causes much more damage than a fender bender in a parking lot. It turns out that an object’s kinetic power increases together the square that its speed. A car moving 40 mph has 4 times as much kinetic energy as one moving 20 mph, while at 60 mph a vehicle carries ripe times as much kinetic power as at 20 mph. Hence a modest increase in speed can reason a huge increase in kinetic energy.
These principles are merged in the equation because that kinetic energy.
In words: Kinetic power equals the fixed of the relocating object time the square of that object’s speed (v2).
In equation form: kinetic power (joules) = 1/2 x mass (kg) x velocity2 (m/s)
In symbols: KE = 1/2 x m x v2
Examples: Bowling Balls and Baseballs What is the kinetic energy of a 4-kg (about 8-lb) bowling sphere rolling down a bowling roadway at 10 m/s (about 22 mph)?
Compare this power with the of a 250-gram (about half-a-pound) baseball travel 50 m/s (almost 110 mph). I m sorry object would certainly hurt an ext if that hit girlfriend (i.e., which object has actually the better kinetic energy)?
Reasoning: We have to substitute numbers right into the equation for kinetic energy.
Solution: because that the 4-kg bowling sphere traveling in ~ 10 m/s:
kinetic energy (joules) = 1/2 x fixed (kg) x
=1/2 x 4 kg x (10 m/s)2 = 1/2 x 4 kg x 100m2/s2 = 200 kg-m2/s2.
Note that: 200 kg-m2/s2 = 200 (kg-m/s2) x m = 200 N x m = 200 joules
For the 250-g baseball traveling at 50 m/s:
kinetic energy (joules) = 1/2 x massive (kg) x
A gram is a thousandth of a kilogram, so 250 g = 0.25 kg:
kinetic energy (joules) = 1/2 x 0.25 kg x 2500 m2/s2 = 312.5 kg-m2/s2 = 312.5 joules
Even despite the bowling ball is much more massive than the baseball, a hard-hit baseball carries an ext kinetic energy than a common bowling ball due to the fact that of that high speed.
Asteroid impacts on Earth:
every little thing in the solar device goes around the Sun. These paths roughly the sunlight are dubbed orbits. An orbit is a breakable balance between the forward activity of the orbiting body and also the gravitational attraction in between the Sun and the orbiting body.
Because that the gravitational attraction in between and among all the orbiting body in the solar system, no two orbits room the same. These tiny differences in orbit do not affect large planets very much, but little bodies orbiting the sun - choose asteroids - deserve to be strong affected. Asteroids - packed fairly close come one an additional in the asteroid belt - can collide with one one more or graze past each other as their orbits transition over time. This may result in one asteroid bumping or bouncing out of Its previous orbit and transforming into a various orbit that is referred to as "Earth-crossing." The diagram listed below shows a typical Earth-crossing orbit for an asteroid. The sun is displayed in red, the planet in green, and the asteroid in yellow. Note - This diagram and also the object sizes room NOT in ideal scale.
Also, in this figure, objects choose Mercury, Venus, Mars, and the asteroids space not included for simplicity.
As you deserve to see, together the Earth and the asteroid go around the Sun, over there is some chance that they may be in the same ar at the exact same time one day and also thus an energetic collision might take place.
The usual velocity of one asteroid in an Earth-crossing orbit and in the vicinity of planet is around 20 km/sec. The kinetic power equation says that KE = 1/2 m x v2. Squaring the velocity provides a big number prefer 20 km/sec much, much larger.
We space going to take into consideration what occurred in Alabama throughout the age of dinosaurs (specifically about 83 million years ago) once an asteroid around 380 m in diameter struck central Alabama. This event occurred about 20 kilometres north of Montgomery, Alabama, close to the city of Wetumpka. You must go to this connect to read more about this event prior to continuing this laboratory: Click Here
When you have actually finished analysis this on-line write-up at the Encyclopedia the Alabama internet site, you will be ready to do the data collection activity in her lab book.
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