Chapter 4 Forces and Newton’s Laws of Motion. Motion and Newton’s first law What is a force? Identifying forces Newton’s second law Free-body diagrams Newton’s third law. Topics:. Sample question:. - PowerPoint PPT Presentation
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Sample question:These ice boats sail across the ice at great speeds. What gets the boats moving in the first place? What keeps them from going even faster?
Slide 4-1
Example
An elevator, lifted by a cable, is going up at a steady speed. • Identify the forces acting on the elevator.
• Is FT,cable => elevator greater than (A), equal to (B), or less than
Fg,Earth => elevator (C)? Or is there not enough information to tell
Newton 0th LawObjects are dumb - They have no memory of the past and cannot predict the future. Objects only know what is acting directly on them right now
Newton's 1st LawAn object that is at rest will remain at rest and an object that is moving will continue to move in a straight line with constant speed, if and only if the sum of the forces acting on that object is zero.
Newton's 2nd Lawacceleration of an object = sum of forces acting on that object / the mass of the object
Newton's 3rd LawRecall that a force is an interaction between two objects. If object A exerts a force on object B then object B exerts a force on object that is in the opposite direction, equal in magnitude, and of the same type.