Do you know what energy is ? Energy is the ability to do work or cause change. Power is the rate at which energy is transferred. In every movement energy.

My Energy Project

By Karli Wlaschek

IntroductionDo you know what energy is ? Energy is the ability to do work or cause change. Power is the rate at which energy is transferred. In every movement energy is used . Well, today I will show you how many Energy transfers/transformation there are in Tennis and you will be surprised how many there are.

This is James Prescott Joule he is known for the unit in which energy is measured and it is named after him.

Video watching!!

When I hold the ball in my hand…

I have Gravitational Potential Energy. Because I am holding my ball in my

hand and it is not moving and because it is also over the surface

When I pull my hand out and release it…

Chemical Energy is transformed to Kinetic Energy.

This makes my hands swing back and then forward to hit the ball.

Hitting the Ball… When the kinetic energy reaches the ball it is

transferred from the tennis racket to the ball. Please do not forget:

If I would shoot the ball with a wooden board it would never get as high as with the tennis racket because of the string.So elastic potential energy from the racket helps it get higher.

Kinetic Energy of my racket hits the ball, Energy is lost due to Sound Energy.

Flight of the ball…

THE WHOLE FLIGHT OF THE BALL IS KINETIC ENERGY

If I hit the ball very strong it will fly farther than if I hit it softly.

When the ball reaches it highest spot, it is still KE but it is also Gravitational Potential Energy because now it just has to fall down.

Landing of the ball… When the ball hits the ground a bit of Kinetic

Energy is transformed into Sound Energy. The ball didn’t stop, it keeps bouncing and

rolling. When I drop most objects they make a

sound. Can anyone think of a object that if you drop

it from for example 1 Meter it will not make a sound?

Bouncing and rolling… The tennis ball has not stopped yet. It

will start bouncing For every bounce the KE is transformed

into GPE when the ball is at its highest spot of the bounce

Then it is transferred back into KE Each time the tennis ball bounces up it

will bounce down until it will end still.

Thanks for watching