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Force and Motion

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Force & Motion
The First Law: Force and Inertia
Object remains at rest will remain at rest unless acted upon by unbalanced force.

Object in motion will continue at constant speed and motion unless acted upon by unbalanced force.

Force is an action that can change motion.

A force is what we call a push or a pull, or any action that has the ability to change an object’s motion.

Forces can be used to increase the speed of an object, decrease the speed of an object, or change the direction in which an object is moving.

Classification of Forces

1. Effects on motion- Balanced forces produce no motion or motion with constant velocity, while unbalanced force produce accelerated motion. 2. Line of Action- Parallel forces may go in the same direction or in opposite directions while Concurrent forces are those that meet at a point. 3. Relations to Work- Conservative forces are those that can do work and can stores energy. Non conservative are forces that can do work but cannot store energy. 4. Interaction of Bodies- Contact force when object is push by another & Distant force no contact between objects.
Equilibrium

1. Stable- line passed through its center of gravity falls within the base. 2. Unstable- line dropped through the center of gravity does not fall with in the base. 3. Neutral- Does not change the center of gravity with slight tipping.
Inertia is a term used to measure the ability of an object to resist a change in its state of motion.
An object with a lot of inertia takes a lot of force to start or stop; an object with a small amount of inertia requires a small amount of force to start or stop.
The word “inertia” comes from the Latin word inertus, which can be translated to mean “lazy.”

Newton's Second Law
An object that has a force acting on it will change its speed (accelerate).
The acceleration of a body is…...

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