Gravitational Forces Flashcards
What did Newton propose?
Newton proposed that Gravitational force is always attractive, and it depends only on the masses involved and the distance between the masses.
Force of attraction between 2 particles
~ ________ proportional to the product of the masses of the particles.
~_________ proportional to the square of the distance between their centers.
Directly
Inversely
What is the equation:
F=Gm1m2/r^2
What is the gravitational constant?
6.67 x 10^-11 (N.m^2.kg^-2)
What is Newton’s law of Universal Gravitation?
Every particle in the universe attracts every other particle with a gravitational force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
What is weight?
Weight is defined as the gravitational force the Earth exerts on any object on or near its surface.
What the difference between mass and weight?(4)
Definition
Scalar or vector and why
Unit
Mass = Amount of matter in an object Weight=The force of attraction acting on an object Mass=Scalar Weight=Vector Mass= Kg Weight=N Mass=Constant throughout the universe Weight=Varies depending on position
What are things we notice about field lines?(4)
- are perpendicular to the surface
- do not cross
- point towards the centre of the mass
- are closer together the closer they are to the mass
What is gravitational field?
It is a region in which a mass experiences a force due to gravitational attraction.
Near the earth’s surface the gravitational field is _____.
Uniform
How can you find gravitational field strength?
g=force of gravity/mass
What is the si unit for gravitational field strength?
Newton per kilogram (N.kg^-1)
What is the strength of the field dependent on?
Mass of the object causing the field. It can vary in strength from planet to planet.
What is the strength of the field equivalent to?
Free fall acceleration at that point.
