Gravity and Circular motion

Gravity and Circular Motion

On your flow sheet write a paragraph relating gravity to motion as we currently understand it.

Gravity

• Always acting

• it pulls us towards earth

• Is responsible for the movements of earth, planets, solar systems, and galaxies

• Is the weakest force of nature

Gravity

• Gravity acts in a straight line between objects

• Gravitational forces act opposite of each other

• Newton described gravitational force with one law and a simple equation

• Is a Force Field ( it emanates around the whole body from the center of it

Multiple Choice

If we are standing in a single spot do we apply the same force to the earth as the earth applies to us?

• Yes

• No

Open Ended

Explain why the previous question is true.

Law of Universal gravitation

• Newton's law is "universal" because gravity acts on everything throughout the entirety of the universe

• The constant G= 6.67x10^-11. This tiny constant is why gravity is imperceptible between objects of normal size

• F= G m₁m₂/r²

Multiple Choice

In Newtons law of universal gravitation, which variable has the greatest effect on force?

• G

• mass

• radius

Cavendish

• Henry Cavendish measured G within 1.2% of the currrently accepted value when he "weighed the earth" in 1798 nearly 100 years after newton published his theory

• https://www.youtube.com/watch?v=jkjqrlYOW_0

• after he performed the experiment they were were able to approximately measure earths mass with the newly found G and determined earths average density as well

Superposition

• Gravitational forces add together much like any other force to get a net force.

• If we observe phenomenon like spring tides(enhanced) and Neap tides(smaller) we can see the effects of this concept

• 
  

Open Ended

What might be happening when we experience a spring tide vs a neap tide?