Before knowing what are the three Newton's Laws, we have to learn some basic stuff.
They will help us to understand the diagram better.
They will help us to understand the diagram better.
System Schemas & Force Diagram
Newton’s First Law
An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.
Problem setThe only way to slow down a moving object is to apply a net force to it. (True)
A stationary object has no forces acting on it. (False) |
Newton’s Second law
Acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
F=ma Net force on object = mass of object x acceleration Problem setA stunt woman of mass m falls into a net during the filming of an action movie. She experiences a normal force magnitude Fn, start subscript, n, end subscript while touching the net.
The free body diagram for the stunt woman is shown below. Gravity Fg, start subscript, g, end subscript is pulling the person downward, and the net is pushing up on the person with a normal force Fn, start subscript, n, end subscript. Acceleration is upward. Let’s write a vertical Newton’s second law statement to solve for the stunt woman’s acceleration. The answer is |
Newton’s Third Law
All the diagram, except the four from Khan Academy, are drawn by author.
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