In this topic we will consider the following:
- How does the radius of a satellite's orbit affect its speed?
- How do satellites stay in orbit even though they are not powered by anything?
- What is the relationship between gravitational potential energy and position for a non-uniform field?
If your speed is constant how can you be accelerating. When you move in a circle it feels like you are being thrown out so how come the force is towards the centre? If too many people join me on a roller coaster will we all fall to our death
A field is a region of space where an effect is experienced, like particles and waves, it´s a recurring theme in this course. When do we consider the Earths field to be radial and when uniform? Why don´t satellites fall down?
Close to the surface of a large mass (like Earth), the effects of gravitation are uniform. Further out, we realise the the gravitational field of a spherical mass is in fact radial. This has implications for how we calculate forces, field strength, potenti