Final exam first task : kinetic energy report

kinetic energy
Hello all, how are you? on post this time I will invite you to discuss the kinetic energy. you must have heard about kinetic energy, well so what is the kinetic energy??
Kinetic energy is the energy possessed by moving objects.
Kinetic energy of an object is defined as the effort required to move an object with a given mass from rest to reach a certain speed. Kinetic energy is divided into two translational kinetic energy and rotational kinetic energy.
First we will discuss about the translational kinetic energy .translational kinetic energy (KE) is the energy possessed by a moving object straight. 

I once played marbels, first I put a marble at a point that we consider point A then I have pushed it so marbel marbel move straight and had stopped at point B. When the marble was being moved from point A to point B, he has a kinetic energy proportional to its mass and the square of the velocity.
so if we assume that the mass of marble is 0.2 kg and its speed is 0.1 m / s ^ 2 we can determine the kinetic energy possessed by the marble using the equation: KE = 1/2 m v ^ 2 

so that we have the result is 0,001 joules. 

 

Now we will discuss about the rotational kinetic energy.
rotational kinetic energy is the energy possessed by objects that perform rotational motion.

 
one time I ever rode a bike from my house to the store. My wheels have being doing
rotational motion so that they have a rotational kinetic energy.

we can determine the amount of rotational kinetic energy by using the equation:
ER = 1/2 I w ^ 2

or we can say rotational kinetic energy is proportional with moment inertia and its angular velocity.

so if we assume that the moment of inertia wheel my bike is 0.8 and the angular velocity is 15 rad / s ^ 2, using the equation above we can see that the rotational kinetic energy carried by the wheels of my bike is at 90 joules.