Presentation on theme: "Foundations of Physical Science Workshop: Variations in the Heating and Cooling of Earth."— Presentation transcript:
Foundations of Physical Science Workshop: Variations in the Heating and Cooling of Earth
Key Question What causes the seasons?
Two part Investigation First,we will measure how variations in DISTANCE effect light intensity Then, we will measure the light intensity at different PLACES on the globe
Light Intensity and Solar Energy Greater tilt angle spreads the light out over more area More direct light = more energy/area = greater intensity Areas with greater intensity will heat more
Developing a hypothesis about the seasons
Setting up your model of Earths orbit around the sun The light represents the sun Measure the light intensity with the solar cell and multimeter Compare values
Measuring Light Intensity based on Distance Four distances A – 150 cm B – 147 cm C – 149 cm D – 153 cm
Results Position Distance from the sun (km) Scale distance from the sun (cm) Light intensity (mA) A 150,000, B 147,000,000 C 149,000,000 D 153,000,000
Results Position Distance from the sun (km) Scale distance from the sun (cm) Light intensity (mA) A 150,000, B 147,000, C 149,000, D 153,000,
How does Earths tilt affect the suns intensity?
Findings What role does axial tilt play in the intensity of light on Earth? At which position (A-D) and latitude does Earth receive the most light? The least light? Which factor, distance or axial tilt, plays the most significant role in casing the seasons? Was your hypothesis supported by your results?
Where is Summer in the Northern Hemisphere? (and why) From position D to A is summer for the Northern Hemisphere That is the segment of Earths orbit where the Northern Hemisphere is pointing at the sun and getting the most direct, and therefore most intense light