ENERGY

DRAW THIS DIAGRAM



Mechanical, Kinetic and Potential Energies
There are two forms of mechanical energy - potential energy and kinetic energy. Potential energy is the stored energy of position. In this set of problems, we will be most concerned with the stored energy due to the vertical position of an object within Earth's gravitational field. Such energy is known as the gravitational potential energy (PEgrav) and is calculated using the equation PEgrav = m•g•h where m is the mass of the object (with standard units of kilograms), g is the acceleration of gravity (9.8 m/s/s) and h is the height of the object (with standard units of meters) above some arbitraily defined zero level (such as the ground or the top of a lab table in a physics room). Kinetic energy is defined as the energy possessed by an object due to its motion. An object must be moving to possess kinetic energy. The amount of kinetic energy (KE) possessed by a moving object is dependent upon mass and speed. The equation for kinetic energy is KE = 0.5 • m • v2 where m is the mass of the object (with standard units of kilograms) and v is the speed of the object (with standard units of m/s). The total mechanical energy possessed by an object is the sum of its kinetic and potential energies.

After opneing the following Sim: []

WRITE AND ANSWER THESE QUESTIONS;

After Opening the program check the bar graph box (you can pause the skater at different points:
 * 1. What pattern exists between potential and kinetic energy demonstrated by the skateboard? **

This is considered a closed system,
 * 2. How does the total energy change durring the motion? **

Chose the energy verse time graph:
 * 3. What trend (pattern between the variables) do you see in this graph? Draw the graph. **

Chose the energy verse position graph:
 * 4. What trend (pattern between the variables) do you see in this graph? Draw the graph. **

Chose different skaters:
 * 5. How do the trends and energy values change when you use a different skater? **

Adjust the track into 2 different shapes, draw the shape and answer the question below.


 * 6. Is this track still a closed sysem, how did the energy patterns change? **

Add segments to the track to create a roller coaster with at least one loop, diagram your final track.


 * 7. What was the process you went through in creating this roller coaster track, **


 * 8. Which variables had the greatest impact on the success or failure of your track explain their impact? **


 * 9. What was the pattern of PE and KE dempnstrated by your track? **

10. 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground.

a. Determine the kinetic energy possessed by the skydiver. b. Determine the potential energy possessed by the skydiver. c. Determine the total mechanical energy possessed by the skydiver.