Edited Invalid date
4.1 Development of Force Concept
His ideas were accepted by the church and scientific community after his death.
The first law of motion was formed by Galileo.
The work of his predecessors enabled him to develop laws of motion, discover the law of gravity, and make great contributions to the theories of light and color.
It is amazing that many of these developments were made without the benefit of the usual interactions between scientists today.
It wasn't until the advent of modern physics that it was discovered thatNewton's laws of motion only produce a good approximation to motion when the objects are moving at less than the speed of light.
The realm of classical mechanics is defined by these constraints.
Albert Einstein and many other scientists developed quantum theory at the beginning of the 20th century.
The constraints in classical physics do not apply to this theory.
All of the situations we consider in this chapter are in the realm of classical physics.
The concept of cause and effect was not always important in human thinking.
Modern physics evolved from natural philosophy.
The achievements of Galileo,Newton, Einstein, and others were important in the history of scientific thought.
The work of these scientists is the basis of most of the scientific theories described in this book.
A definition of force is needed to understand this.
A push or pull is a good place to start.
We know that a push or pull can have both magnitude and direction and can vary greatly in each regard.
A cannon exerts a strong force on a cannonball that is launched into the air.
Earth exerts a small downward pull on a flea.
Our everyday experiences give us a good idea of how many forces are involved.
The forces are represented by arrows and can be added using either the head-to-tail method or trigonometric methods.
TwoDimensional Kinematics was used to develop these ideas.
The overhead view shows two ice skaters pushing on a third.
The total force on the third skater is shown in the direction shown.
The free-body diagram shows the forces acting on the third skater.
The body is represented by a single isolated point, and only those forces acting on the body from the outside are shown.
Free-body diagrams are used extensively in the study and application ofNewton's laws of motion.
Review flashcards and saved quizzes
Getting your flashcards
Privacy & Terms