Force & Motion : Force & Motion
Instructional objectives : Instructional objectives You will be able to define force and its units
You will be able to define and understand Newton's Laws of motion.
You will be able to understand Inertia.
You will be able to define motion/Speed/velocity/Instantaneous velocity/Average velocity.
INTRODUCTION : INTRODUCTION Force & Motion are two of the important concepts in Physics. They are united in a subject called “Dynamics". Force is the cause of acceleration not motion.
Force : Force Force is a push or pull which change or tends to change the state of motion or rest of a body.
Effects of force : Effects of force It can change the dimension.
It can start motion.
It can stop motion.
It can change the speed or direction of Motion.
Unit of Force : Unit of Force Sir Isaac Newton was the scientist who had given the concept of force therefore the unit of force has been given after his name.
Newton (N)
If a push or pull produces an acceleration of 1m/s2 on a mass of 1 Kg one Newton force is said to be acted upon.
Newton's First Law of motion. : Newton's First Law of motion. Newton observed that a body remains in the state of acceleration or rest until an external force is not applied to the body.This inherent property of the object is called inertia and the law is known as law of inertia.
Slide 8 : The law of inertia is most commonly experienced when riding in cars and trucks. In fact, the tendency of moving objects to continue in motion is a common cause of a variety of transportation injuries
Slide 9 :
Newton’s Second Law of Motion. : Newton’s Second Law of Motion. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
Slide 11 : F=m*a
Or we can say acceleration a=F/m
As force increases it will increase the acceleration of object and when mass increases the acceleration decreases.
Slide 12 :