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# How is Mechanical Energy Transformed?

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on 24 January 2015

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#### Transcript of How is Mechanical Energy Transformed?

How is Mechanical Energy Transformed?
Energy Transformations
Energy appears in many forms. It can be changed from one form to another.
INTRODUCTION
Energy is an important part of our daily lives. It exists in many forms. The food we eat provides our body with energy that allows us to do work. Electrical energy lights our homes and enables us to use electrical devices. Fuel is used to make vehicles run.

Energy is used to do work.

Whenever work is done, energy is changed into different forms, but during each information the total amount of energy stays the same. Everyday, we use and exert energy. It's everywhere, so an understanding of that energy is important for us to understand some other important things in our surroundings, too.
SOME KEY POINTS TO UNDERSTAND
Potential Energy (PE)
Is stored energy

Kinetic Energy (KE)
Is the energy of an object due to its motion

Elastic Potential energy
Is the energy that an object has when it is stretched or compressed

Gravitational Potential energy
Is stored energy due to its relative position away from the center of the earth.

EXAMPLES OF ENERGY TRANSFORMATION
The PE of the water at the top is transformed into KE as it falls.
EXAMPLES OF ENERGY TRANSFORMATION
When the archer draws the arrow into position, work is done which is equal to the elastic PE of the drawn bow. The elastic PE becomes the KE of the arrow when released.
SOME KEY POINTS TO UNDERSTAND
Here are some thins we'd have to keep in mind when studying about energy.

Mechanical energy
- can be in the form of either kinetic energy or potential energy
- cant be transferred from one form to another as shown in the change from PE to KE and vice-versa in the following

SO WHAT IS MECHANICAL ENERGY?
Mechanical energy can be in the form of either kinetic energy or potential energy.
Mechanical Energy can be transformed from one form to another as shown from the change in the Potential Energy and the Kinetic Energy. It can either be from Potential to Kinetic or Kinetic to potential. Our examples will show the change of energy.
MECHANICAL
ENERGY
CHEMICAL
ENERGY
ENERGY
ELECTRICAL
ENERGY
SOUND AND LIGHT
ENERGY
CHEMICAL
ENERGY
ELECTRICAL
ENERGY
MECHANICAL
ENERGY
CHEMICAL
ENERGY
ELECTRICAL
ENERGY
LIGHT
ENERGY
EXAMPLES OF ENERGY TRANSFORMATION
When raised to vertical position A, the dog gains maximum gravitational PE.
When released from position A, PE is transformed partially into KE until it reaches point B where the KE is maximum. The PE at A is converted into KE at B. As the swing moves from point B to C, the KE decreases while the PE increases until it reaches point C. The PE at points A and C are equal.

EXAMPLES OF ENERGY TRANSFORMATION
In this video, an engine pulls the roller coaster up to the top of the first hill or loop to attain a maximum PE. It should fall down on the track on its own. It moves as a result of interchange between PE and KE. If there is a great imbalance in the forces or energies applied, there would be an accident. The roller coaster, instead of staying on the track and rolling down after the loop, it flew away from the tracks, meaning that the track’s grip was not strong enough and the kinetic energy released was too high and caused the coaster to “fly away”.
EXAMPLES OF ENERGY TRANSFORMATION
In bungee jumping an elastic string is attached to the ankles of the jumper. As jump is made from a certain height, the jumper undergoes a series of energy transformations. Before elastic string stretches: gravitational PE of a man KE of a man. Elastic string starts to stretch: gravitational PE of a man elastic PE of the string + KE of the man. At the lowest position: gravitational PE of a man elastic PE of the string. in rebound: elastic PE of the string gravitational PE of the man + KE of the man

EXAMPLES OF ENERGY TRANSFORMATION
When a diver jumps from a spring board, a series of energy transformation take place. Before diver jumps: gravitational PE. When divers jumps up: loss KE of diver ----- gain in PE. At the highest position: momentarily at rest, all KE of diver ----- his PE. Falls from the highest position: lost of PE of diver ----- his gain in KE. Above the water surface max speed. Enter water: futher losses PE and KE; mechanical energy of diver done against friction in water. The lowest position: all mechanical energy of diver------ internal energy of water.

APPLICATION
Collect at least three mechanical toys.
observe and explain the transformation of mechanical energy that occurs in the operation of the toys.

END OF PRESENTATION
THANK YOU FOR LISTENING
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