What are Newtons laws.?
Newtons laws are simply part of the foundational physics that describes the relationship between forces and motion. Newtons laws are part of what we called Classical Physics, meaning that it's used to describe more general basic phenomena and the foundational of classic mechanic's.
Newtons first law (Law of Motion)
" That an object at rest stays at rest, and an object in motion continues in motion at a constant velocity in a straight line unless acted upon by a net external force."
This is one of the foundational key elements of classical physics. So, an object will remain at rest or a uniform motion until an unbalanced force act on it. Force = time of change of momentum. The natural tendency of objects to maintain their state of motion is also called inertia. How come the objects on earth do not maintain their state of motion then.? On earth we have several different forces acting on our object that create drag and stop our object from maintaining their state of motion. e.g. gravity which pulls the object down which will create friction and will start preventing our object from maintaining its motion. We also have a lot of other factors like if there's an opposing force like air resistance.
This equation states that an object at rest will remain at rest unless acted by on an external net force.
The equation says that when force (F) is = to 0 acceleration (a) is also = to 0. If 200 newtons of force is acted on to the object it will translate to 20 m/s² of acceleration. (Assuming we say there's no Opposing force and the object weighed 10kg.)
Newtons second law
"The acceleration of an object is directly proportional to the net force acting on it and inverse proportional to its mass"
The part where it says "the acceleration will be proportional to the net force act on it" which means that it will be harder to accelerate an object if its mass is larger and it will be easier to accelerate an object if its mass is lower. We can represent Newtons second law as F = ma where F = Force and ma = Mass. We can also calculate the acceleration of the object using the equation.
This equation is used to calculate the acceleration of an object were (A) = Acceleration, (ΣF) = Summed up forces and the (M) = Mass. Remember that acceleration has an inverse relationship with its mass.
If an object is moving close to the speed of light or very tiny e.g. subatomic particles, electrons, protons. neutrons then Newtons second law will not work so we will have to rely on Einstein's theory of Relativity.
Newtons Third law
" For every action there's an equal or opposite reaction"
When A puts force on B, B puts force on equal opposite's force on A. Also keep in mind when it says action or reaction we are talking about forces because its only applicable to forces and nothing else. Theres also a common miss-conception where we think that one force happens before the other, but it happens simultaneously the force also lasts for the same amount of time as both of them.
Force do not exist in isolation Although force arise from interactions between several object they come in pairs - both of the interacting objects experience force but not any type of force.
The 2 forces in force pain are fundamentally related they're equal in magnitude and opposite in direction.
This is newtons third law. If an object ( A ) exerts force Fa on B on Object A the 2 forces are equal in magnitude and opposite in directions,