Earth's Gravitational Field

From the Yr 12 HSC Physics module Space

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Last updated: July 27, 2018

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Question	Answer
Gravity is a force of __________ that exists between any two masses.	Attraction
What is the force of attraction between our mass and the Earth's (or some other heavenly body)?	Weight
What are the three classical vector force fields?	Gravitational
	Electric
	Magnetic
What does the field vector g also represent due to Newton's Second Law of Motion?	Acceleration
What equation represents the Law of Universal Gravitation? (m1=larger object's mass, m2=smaller object's mass, r1=larger objects radius)	F=Gm1m2/r1^2
What acceleration due to gravity measured in?	m/s^2
What are the three main factors that determine the value of g on Earth? (The first part has three subfactors in it, addressed below)	Location
	Altitude
	Mass
What are the three factors that effect gravity that purely depend on the location on the Earth's surface?	The thickness of crust in that location
	The flat poles are closer to centre so higher g
	The spinning Earth creates centrifuge effect that reduces gravity near equator
What is the equation for calculating gravity?	g=Gm/r^2
What does Newton's Second Law of Motion state (equation)?	F=ma
What can be defined as the energy required to move a mass to a specific point within a gravitational field?	Gravitational Potential Energy
This is calculated using what equation? (Let ^ be equal to Ep)	Ep=mgh
By assuming the object is being moved to a point in a gravitational field where the zero level is at infinite, what must the value of Ep always be?	Negative
What equation calculates the Ep of any two objects (m1 is mass of object 1, m2 and object 2 also, r is the distance between them)	Ep=-Gm1m2/r
What is the three significant figure value for the constant G used in the above equations? (Scientific Notation is used)	6.67x10-11

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