Newton's Law 1
A body remains at rest or moving at a constant Velocity unless a Resultant Force acts on it. Newton explained this law by stating that all objects have Inertia.
Newton's Laws of Motion
If two identical forces are applied from both sides of a body...
If one force is greater than the other...
Newton's Law 2
For a body of constant Mass, its acceleration is directly proportional to the Resultant Force acting on it. Force acting on the body = k * Acceleration of the body
For a constant Resultant Force acting on bodies of different Masses, the acceleration of the bodies is inversely proportional to their Mass. Acceleration of body = 1 / Mass of body
*By bringing the pointer on the Tecnical Terms, you can see the definitions.
Therefore you can say that Force applying on a body = Body's mass * Acceleration of body or
F=ma But in the real world, there is many other factors, such as Air Resistance and Friction. So these laws don't always work, although they always work if you ignore all the unmeasurable factors.
Acceleration due to Gravity (g)
All objects, if they fall freely due to Gravity, have the same acceleration called the "Acceleration due to Gravity". The acceleration varies slightly from place to place on earth, and in Germany it is about 9.8m/s/s, but we usually take "g" on earth to be approx. 10m/s/s. So, if we drop two bodies with the same shape and volume from the same hight...
But you should also remember that this result is only guaranteed if the two bodies have the same shape and same bottom surface area, because Air Resistance acts on both objects.
