# Experiment to Find Acceleration due to Gravity

### Experiment to Find Acceleration due to Gravity

Aim
The aim of my experiment is to measure the earth’s gravitational field strength, which is also the acceleration due to gravity. This involves mass, which is the amount of matter an object contains and weight which is the force of gravity pulling down on an object with a mass. Mass is measured in Kg and weight is measured in Newton’s. Gravity is the weakest of the four fundamental forces, yet it is the dominant force in the universe for shaping the large scale structure of galaxies, stars, etc.

The earth’s gravitational field strength is calculated by the weight (N) / Mass (Kg), therefore the earth’s gravitational field strength (g) is measured in (N/Kg). As an object is in free-fall it accelerates at the rate of g.

Hypothesis
Isaac Newton firstly discovered gravity when an apple fell on his head. He then discovered that every object has a mass and that two masses attract each other. This attraction has a gravitational field strength, Isaac Newton discovered that g = 9.81 N/Kg. This is now a well now fact and is accepted as the earth’s gravitational field strength.

Definitions

Gravity Force

The force of gravity is the force at which the earth, moon, or other massively large object attracts another object towards itself. By definition, this is the weight of the object. All objects upon earth experience a force of gravity which is directed "downward" towards the centre of the earth. The force of gravity on earth is always equal to the weight of the object as found by the equation:

Gravitational force (weight) = m * g
where g = 9.8 m/s2 (on Earth)
and m = mass (in kg)

Normal Force,
The normal force is the support force exerted upon an object which is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book. On occasions, a normal force is exerted horizontally between two objects which are in contact with each other.

Friction Force,
The friction force is the force exerted by a surface ...