1.33 use the relationship between orbital speed, orbital radius and time period

By using this relationship, we can calculate the orbital speed of planets if we know it's distance from the Sun and the time it takes for one orbit around the Sun.

Therefore,  using the information from this table, we can calculate each planet's orbital speed.

The results are shown in this table:

Now, we can draw up a graph showing the orbital speed of different planets, against their distance from the Sun.

Questions
1. Compare the speeds of planets closest to the Sun to those further away
The closer to the Sun, the faster the planet's orbital speed

2. Explain the difference
The speed of which a planet orbits is proportionate to the Sun's gravitational force. The greater the gravitational force, the more 'force' planets experience and hence gains more velocity, and because gravitational force of the Sun decreases as distance increases (due to the 'inverse square law' of gravity), the further away a planet is from the Sun, the slower its orbital speed.

http://www.newton.dep.anl.gov/askasci/ast99/ast99121.htm
http://www.newton.dep.anl.gov/askasci/phy05/phy05071.htm

1.35 recall that the Solar System is part of the Milky Way Galaxy

1. What is a GALAXY?
2. Which galaxy are we in?
3. Source an image of our galaxy

http://www.utahskies.org/image_library/deepsky/messier/m031/M31-RobertGendler.jpg
4. What type of galaxy are we in?
5. How many galaxies are there is the Universe?

1.34 describe how the orbit of a comet differs from that of a planet

Source: http://wmatem.eis.uva.es/~marsan/discover/comets/comet-west.gif

1. Four differences between planets and comets are: (roll over lines to see answer)
1. Comets are usually made from _________
2. Comets have highly elliptical _______  compared to planets
3. Comets usually travel _________ than ________
4. Comets usually have long _______ , made when the heat from the Sun which vaporises the comet

1.32 Explain that gravitational force causes the planets to orbit the sun, the moon and artificial satellites to orbit the earth, and comets to orbit the sun

Source:

http://www.suite101.com/content/why-do-earth-planets-orbit-sun-a42229#ixzz1IRTnhLuw