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?
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?
