Kepler's Law and Orbits Simulation

U £ lhpVuft. l orW+s \r 3. closer h) S\JV\ { Sn Vur vwv* s \JV\ ^ slou^v V 4. D «+ ^ \\oO°( ptsMishtctUusS I i. X . 3 • Hp ( °\ pobhshacf " Google "Gravity and Orbits Name; Phet" k^tv- POH Objective 4: Explain each of Kepler’s Laws and apply them quantitatively. Define Key Terms: A . Eccentricity: t f \£Q£ U f pf \ \0 VO -£ llt P ~t" iCAl QlTv /*? f Ul f l *> B. Semi- major axis: biA I -ft r d j a fY*>U>r fT> r ' lorvy^ 1. Is the orbit of a planet circular? • Press the TO SCALE option at the bottom of the screen with only the star and planet chosen • Turn on the path /grid option ON Allow the planet to move through one full orbit • Turn on the measuring tape from the tool bar • 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 Wife Right side from path to star qi . What do you notice about these distances? sn fhetj are rrn 4- e u n l ^ Which of Kepler’s Laws does this relate to? State the law. -irs. i LauJ ~ orbt -hs an? pHipt 2. Linking planetary orbits to Kepler's Laws Leave the TO SCALE and open MODEL Click on sun and planet • Turn path, gravity, and velocity ON Press play and immediately pause after one full orbit What holds the planet in the orbit? rai/ l • • • jlj • Turn ON the gravity force button What direction do the forces face? ztDMl&XjCL • Turn the gravity ( not gravity force ) OFF What happened to the planets and why? -fry * • • • f>tcmp+ Cov )hnurd ifl A vfnQigM < " Turn the gravity (not gravity force) back ON Increase the red velocity arrow very slightly in length Run simulation and observe 4fanyn ' ling, - fhe orbii Did the planets orbit change in any way? If so, how? As irf the nchit- re prw*? / more Increase the red velocity arrow substantially • Run simulation and observe What happened to the planet in orbit? * plflwf did flat 3GgQ3fllfl the ftthit • Decrease the red velocity arrow substantially • Run simulation and observe How did the orbit of the planet change? th-P \ \f\pAr [ /\ho the cmshfldf ya ~ - s> — o -V rr 5 Can this be explained in terms of velocity and gravity? \r K hop IJ rx if a • a f l a y ) t f s \r i * -too l SutA a \ ur>\ x [ Would d Wxw tt> OYC^ Make sure the only thing selected Is the path and grid • Hold the graph paper to the screen and draw the sun in the center of the paper • Run in slow motion, pausing every 30 days and indicating the placement of the planet • Once each month has been marked, mark the orbit path and draw a straight line from each planet to the sun • Count the grid boxes within each month period How do the areas covered during each month compare? eac\r\ rr\\)t r < 4-Vv pf - CQKVH. Is it possible to see Kepler’s 3rd Law using this PhET? Explain. S § 41 ?C — ^ lA —- § £r -* » S U tartly - j) ^ Ooove hhe plahe-f Close tr> Suw ( Ex : . V rvvov datjO ^ ’ ^ l & hfc-jrS W\ Q ~4~r> \ ff ^ rA k ^f # e - &Ar +K Aoijf / . SAO CC-HN yicMAP+ f fhd- an? dos r -fr ^ 4l *v\ Ac V iv\ m £ br£ ( shorter pfbH-flj -fn> mt St v\ -reJp cvf £ r v Un -f* > / \ I HI $ - It 8 o “i (o