Gravity equation physics
What is the formula for gravity?
The formula is F = G*((m sub 1*m sub 2)/r^2), where F is the force of attraction between the two bodies, G is the universal gravitational constant, m sub 1 is the mass of the first object, m sub 2 is the mass of the second object and r is the distance between the centers of each object.
How is 9.81 calculated?
In SI units, G has the value 6.67 × 10–11 Newtons kg–2 m2. The acceleration g=F/m1 due to gravity on the Earth can be calculated by substituting the mass and radii of the Earth into the above equation and hence g= 9.81 m s–2.
What does gravity mean in physics?
Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. Gravity is not just the attraction between objects and the Earth. It is an attraction that exists between all objects, everywhere in the universe.
What are the 3 laws of gravity?
Newton’s Three Laws of MotionEvery object in a state of uniform motion will remain in that state of motion unless an external force acts on it.Force equals mass times acceleration [ ].For every action there is an equal and opposite reaction.
What is work formula?
Work is done when a force that is applied to an object moves that object. The work is calculated by multiplying the force by the amount of movement of an object (W = F * d).
Why is gravity 9.81 ms 2?
A: Gravity (or the acceleration due to gravity) is 9.81 meters per second squared, on the surface of Earth, because of the size of Earth and the distance we are on its surface from its center. Throughout space, gravity actually is constant.
What is the SI unit of force?
The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.
What is the force of gravity on Earth?
Is gravity just a theory?
Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915), which describes gravity not as a force, but as a consequence of masses moving “straight ahead” in a curved spacetime caused by the uneven distribution of mass.
Is gravity a real force?
In general relativity, gravity is a fictitious force. In classical mechanics, fictitious forces are not considered “real” forces. If you believe that inertial forces are forces, then gravity is a force. If you believe that inertial forces are not forces, then gravity is not a force.
Who invented gravity?
What is the first law of gravity?
Newton worked in many areas of mathematics and physics. He developed the theories of gravitation in 1666, when he was only 23 years old. Newton’s first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
How did Einstein explain gravity?
GETTING A GRIP ON GRAVITY Einstein’s general theory of relativity explains gravity as a distortion of space (or more precisely, spacetime) caused by the presence of matter or energy. A massive object generates a gravitational field by warping the geometry of the surrounding spacetime.