Hi, can you help me with this lab please, i do not know how to use this website.

Open the simulation by clicking on the link:

https://phet.colorado.edu/sims/html/gravity-and-orbits/latest/gravity-and-orbits_en.html

you can Take a look at the explanatory video via YouTube: https://youtu.be/m6e2y4fef1I

Kepler's Laws & Orbits PhiET In this activity students will be exploring Kepler's Laws and Orbital Motion using the "Gravity and Orbits" PhET simulation. Open the simulation by clicking on the link: https:/phet.colorado.edu/sims/html/gravity-and-orbits/latest/gravity-and-orbits_en.html Take a look at the explanatory video via YouTube: https://youtu.be/m6e2y4fef1/ 15 Learning Objectives By the end of these activities it is hoped that students will have an acquired the following skills: . Following explicit instructions to gain acquired knowledge . Investigate the shape of planetary orbits . Relate how planetary orbits link to Kepler's first two laws of planetary motion. Author: Simon Lees 20171. Is the orbit of a planet circular? - Press the TO SCALE option at the bottom of the screen with the star and planet chosen, see opposite image. - Turn on the path/grid option ON, see green circle. .Do - Allow the planet to move through 360. - Turn on the measuring tape from the tool bar, green circle. - Measure the horizontal distance from the path line on the left of the star. Write the measurement in the table below. - Now do the same from the star to the path line on the right hand side. Distance (miles) Left side from path to star Right side from star to path . What do you notice about the distances? . What does this data say about the orbit of the planet, discuss?2. Linking planetary orbits to Kepler's Laws? - Go to model - Click sun and planet - Press PLAY, blue circle (with path/gravity/ velocity/grid ON, green circle) and leave for one cycle then PAUSE . Screen shot trajectory Screenshot of the trajectory . What holds the planet in the orbit? What shape is the orbit use the screenshot to explain this? - Turn ON gravity force button, green circle above. Screenshot of the . What direction do the forces face, trajectory screenshot this as proof? - Turn the gravity OFF, green circle above. . What happens to the planet & why, screenshot this as proof? Screenshot of the direction 3 Author: Simon Lees 2017- Now increase slightly the velocity of the plant by extending the red "v' arrow of the planet, green circle. . What happens to the planet in the orbit? . What is the shape of the orbit when increased? - Now increase the velocity of the plant to a large extent by extending the red 'v' arrow. . What happens to the planet in the orbit? - Now decrease slightly the velocity of the plant by diminishing the red 'v' arrow, green circle. . What happens to the planet in the orbit? .Do . What is the shape of the orbit when increased? - Now decrease the velocity of the plant to a large extent by moving the 'v' arrow in. . What happens to the planet in the orbit? . Now try to explain this in terms of v and gravity? 4 Author: Simon Lees 2017. Is the velocity constant throughout the journey? . Which one of Kepler's law does this relate to? - With the star and planet chosen and path/grid on, increase the size of the star by sliding the controller to 1.5/1.75/2.0, green circle. .Do . What do you notice about the orbit? . What happens to the velocity on the path? - Now do the same but change the planets mass 1.5/1.75/2.0, blue circle. . What do you notice about the orbit? . Why do you think the observation for your .Do previous answer occurs? 5 Author: Simon Lees 2017