0The First law of motion of Newton give us powerful tools to analyze forces and solve problems.
First Law : Statement If a body has a number of forces F1,F2, F3 ...Fn acting on it it will remain in a state of constant motion if
∑F = 0
(that is the sum of all the forces from F1 TO FN is equal to zero.)
In order to check if FN = 0 resolve forces in horizontal and vertical direction. If both are zero then ∑F in all directions is zero.
Please look for key terms like equilibirium and constant velocity when using this law.
This law states that if ∑F = 0 then there is no acceleration in any direction.
Hence this law defines what is force.
Force is said to act only if there it accelerates a body.
