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Forces
by Mary Lager
# Forces

## Vector

### has magnitude

### has direction

### Can add to find the net force

## Types

### Tension

### Ideal Pulleys

### Fundamental Forces

### Contact

## Newtons Laws

### Newton's First Law

### Newton's Third Law

### Newton's Fourth Law

### Newton's Second Law

## Free-Body Diagram

### Shows all the forces acting on an object

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has no mass and no friction

Gravitational, Newton's Fourth Law, g=9.8N/kg, Weakness of the fundamental forces, Why planets orbit around the sun

Weak, Even shorter the Strong force, Radioactive decay process

Strong, Holds protons and neutrons together, Strongest Fundamental force, Negligible at distances much larger then the size of atomic nuclues

ELectromagnetic, Unlimited in range, Fundamental interaction that binds atoms together

Normal, Perpendicular

Friction, Static, proportional to the magnitude of the normal force acting between 2 forces, Kinetic, proportional to the normal force and the independent speed

Interia, reisitance to changes in velocity

An object's velocity doesn't change if and only if the net force on the object is zero

Forces are equal and opposite

Universal Gravitation, F=(Gm1m2)/r*2, attractive force, proportional to masses of the objects

F=ma

Force vector = mass scalar time acceration vector