- Dec 31, 2009
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Gravity affects light and we have to factor in Einstein's theory of general relativity and also that the Human body emits a light source, has a gravitational field and when athletes sweat there clothes are heavier because of the water. There's also a term called Action-at-a-Distance Forces which could also contribute to a knee injury.
Newton's Laws - Lesson 2 - Force and Its Representation
The Meaning of Force
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forcesonly exist as a result of an interaction.
Contact versus Action-at-a-Distance Forces
For simplicity sake, all forces (interactions) between objects can be placed into two broad categories:
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/961102.html
Enter Albert Einstein. In 1915 he proposed the theory of general relativity. General relativity explained, in a consistent way, how gravity affects light. We now knew that while photons have no mass, they do possess momentum (so your statement about light not affecting matter is incorrect). We also knew that photons are affected by gravitational fields not because photons have mass, but because gravitational fields (in particular, strong gravitational fields) change the shape of space-time. The photons are responding to the curvature in space-time, not directly to the gravitational field. Space-time is the four-dimensional "space" we live in -- there are 3 spatial dimensions (think of X,Y, and Z) and one time dimension.
http://gabrielharper.quora.com/In-a-way-were-all-sort-of-eternal
Your personal field of gravity expands hundreds of trillions of miles into space, and will continue its journey millions of years after you die.
Newton's Laws - Lesson 2 - Force and Its Representation
The Meaning of Force
- The Meaning of Force
- Types of Forces
- Drawing Free-Body Diagrams
- Determining the Net Force
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forcesonly exist as a result of an interaction.
Contact versus Action-at-a-Distance Forces
For simplicity sake, all forces (interactions) between objects can be placed into two broad categories:
- contact forces, and
- forces resulting from action-at-a-distance
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/961102.html
Enter Albert Einstein. In 1915 he proposed the theory of general relativity. General relativity explained, in a consistent way, how gravity affects light. We now knew that while photons have no mass, they do possess momentum (so your statement about light not affecting matter is incorrect). We also knew that photons are affected by gravitational fields not because photons have mass, but because gravitational fields (in particular, strong gravitational fields) change the shape of space-time. The photons are responding to the curvature in space-time, not directly to the gravitational field. Space-time is the four-dimensional "space" we live in -- there are 3 spatial dimensions (think of X,Y, and Z) and one time dimension.
http://gabrielharper.quora.com/In-a-way-were-all-sort-of-eternal
Your personal field of gravity expands hundreds of trillions of miles into space, and will continue its journey millions of years after you die.