Summary GR 12 IEB PHYISCS: GRAVITATIONAL AND ELCTRIC FIELDS
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Course
Physical Sciences
Institution
12
GRAVITATIONAL AND ELECTRIC FIELDS
Digital study notes using the Cornell method, with questions in the margins!
EVERYTHING you need to know for your final exam!
Notes include all the needed formulas and diagrams
Gravitational
Gravitational &
& Electric
Electric Fields
Fields
Newton's Laws of F= force of attraction between objects (N)
Universal G = universal gravitational constant (6,7 x 10^11 N.m^2/kg^2
Gravitation m= object mass (kg)
r= distance between object centres (m)
radius: centre of mass
ratios: 1. Write out the formula - centre of mass
2. Manipulate the known subject
3. Substitute changes into formula (KEEP SYMBOLS!) Direction is always
attractive
4. Simplify ratio number
- both objects
5. Replace original formula with unknown symbol. experience same force
NB! Definitions!
Determining gravitational acceleration (g): G ATTRACTION IS A VECTOR!!
Object mass is irrelevant. P = planet
How would I describe a A gravitational field is a region in space where a mass will experience force
gravitational field in a the gravitational field and acceleration due to gravity (g) are equivalent
paragraph?
Know the difference: g vs G = (g) Gravitational Acceleration (9.8m/s): the acceleration
due to gravity on a specific planet.
(G) Universal gravitational constant (6.7x10^11 N.m^2/kg^2): proportionality constant
which applies everywhere in the universe.
Mass vs weight: Mass (kg) A scalar quantity of matter which remains constant
everywhere in the universe.
Weight (N) (gravitation force): the gravitational fore the earth exerts on any object.
Weight differs from planet to planet. Fg = mg. vector quantity.
Nb! Both objects experience the same force (newton's 3rd law), direction specific, can be
added or subtracted.
How do I work out
attraction between
earth & moon?
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