Mechanics is a branch of physics that deals with motion and the behavior of bodies under the effect of forces.
Figure 1: The branches of Classical Mechanics
Newton's Law of motion
- First Law
"A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an external force."(Equilibrium/Inertia)
- Second Law
"The force acting on an object is equal to the mass of that object times its acceleration." (Accelerated motion, F = ma)
- Third Law
"For every action, there is an equal and opposite reaction." (Action-reaction)
- Finding Normal force example 1
A box is sitting on the floor as shown on the figure below, calculate the normal force, N(in kN).
Figure 2: Finding normal force
- Finding the acceleration of an object at a certain time given position function
Find the acceleration of the object at t = 5 sec as described on the figure below.
Figure 3: Problem description with position function given
- Finding the position and velocity of an object at a certain time given acceleration function
Figure 3: Problem description with acceleration function given
(a)the position of the object at t = 2 sec and,
(b)the velocity of the object at t = 2 sec
as described on the figure below.