Kinetic and Potential Energy

Energy and Power

Potential Energy and Kinetic Energy

Potential Energy

• Energy stored in an object because of its position, condition and shape

• Gravitational potential energy

• elastic potential energy

Gravitational Potential Energy

energy stored in the object because of its higher position from ground

E_g = mgh

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A weight with mass of 40 kg is lifted to the height of 5.2 m.

Calculate the gravitational potential energy gained by the weight.

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How is the height of an paper plane that has mass of 200g if its fly with 100 J energy?

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Quantity of gravitational potential energy depends on

• mass of object

• velocity of an object

• distance from surface of earth

• strength of earth's gravitational potential energy

Open Ended

What is the benefit of gravitational potential energy?

Elastic Potential Energy

• energy stored as a result of deformation of an elastic object as it is compressed or stretched

•  $E_e\ =\frac{1}{2}Fx$  

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a spring with length of 20 cm was compressed with 2 kg weight till the length decreased to 12 cm.

What is the elastic potential energy of the spring?

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An arrow pulled on an elastic bow string. The bow string was pulled with 25 N force and it was pulled 0.5 m from its original length.

Calculate the elastic potential energy stored in the bow string/

Kinetic Energy

Kinetic Energy

• energy possessed by an object due to its motion

•  $E_{k\ }=\ \frac{1}{2}mv^2$  

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Calculate the kinetic energy of a ball with a mass of 200 g and moves at 12.2 ms^-1

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a car with mass of 800 kg moves at a speed of 110 kmh^-1 on the highway. Calculate the kinetic energy of the car motion.

Multiple Select

amount of kinetic energy depends on

• mass of moving object

• speed

• distance from surface of earth

• strength of gravitational force