Gravitational And Eletcric Fields Flashcards
State Newton’s law of universal gravitation.
Newton’s law of universal gravitation states that every particle in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between the centres.
This is represented by the equation F = G(m1.m2)
——————
r^2
Define weight (fg).
Weight (Fg) is defined as the gravitational force the earth exerts on any object on or near it’s surface.
Describe what is meant by the term gravitational field.
A gravitational field is described as a region in space where a mass will experience a force.
Define a gravitational field and give the equation.
A gravitational field is described as the force acting per unit mass.
g=f/m where f is the force experienced by mass m in field g.
What is acceleration due to gravity equivalent to?
Acceleration due to gravity is equivalent to gravitational field.
Give the equation for calculating the acceleration due to gravity on any given planet.
g= G.M(planet)
——————
R(planet)^2
State coulombs law and it’s equation.
Coulombs law states that the force between two charges is directly proportional to the product of the charges and inversely proportional to the distance between the charges squared.
This represented by the equation F = kq1q2
————-
R^2
Describe an electric field.
An electric field is described as a region of space in which an electric charge experiences a force. The direction of the electric field at a point is the direction that a positive test charge would move if placed at that point.
Define the magnitude of an electric field.
The magnitude of an electric field is defined as the force per unit positive charge.
E= F/Q
How would you calculate the electric field strength at a point due to a point charge?
E= kQ
——-
r^2
What is the charge on an electron?
1.6 x 10^-19
How many electrons make up a charge of one coulomb?
6.25 x 10^18
