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• ### Newton's First Law

An object in motion will stay in motion and an object at rest will stay at rest unless acted on by an outside force.

### Object will do what it does unless otherwise acted on

Newton's First Law in a brief

### Air Resistance

Example of an "outside force" that would stop an object

### mass

Newton's first law is directly related to this.

### Inertia

An objects resistance to change its motion

### Newton's Second Law

The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object's mass.

### Fnet=ma

Formula with Newton's second law

### 1N = 1 kg * (m/s²)

Newton is equal to.

### amount of force to accelerate 1kg of mass at 1 m/s²

What is a Newton?

### Newton's 3rd Law

For every action there is an equal and opposite reaction.

### same time, different objects, same amount of force, opposite directions

Action/Reaction force pairs act at the _____ but on ______. They also apply the _______, but in ________.

### force of table on book

Action/Reaction pairs: What is the Reaction pair in a physics book on a table?

### force of book on table

Action/Reaction pairs: What is the Action pair in a physics book on a table?

### gravitational force

When someone jumps up, this pulls them back down.

### pulling earth up

There is a Force pulling us down and there is one doing this too.

### Neither

Which has a bigger force: Earth/Person whilst jumping?

### Earth

Which has a bigger mass: Earth/Person whilst jumping?

### Person

Which has a bigger acceleration: Earth/Person whilst jumping?

### 50 N

A 10kg object is moving at 5 m/s². What is the net force acting on the object?

### 4 m/s²

A 2kg object experiences a net force of 8N. What is the object's acceleration?

### Newton

Units of force

### Physical Interaction

Contact forces arise from....

### Distance

Field forces act over a....

### tension, applied, normal, friction

Types of Contact forces

### gravitational, electromagnetic

Types of field forces

### sum of all forces of an object

A Net Force is a....

### 0N, 0 m/s²

An object is in equilibrium if it's net force equals this and its acceleration equals this.

### not moving, constant velocity

If an object is doing this or traveling at a this, it is in equilibrium.

### No

An object is traveling at a constant 4m/s and moves left. Is it in equilibrium?

### Free Body Diagram

shows all forces acting on an object

### Forces

The arrows in FBDs represent these and go out from an object.

### Weight

The measure of a gravitational force acting on an object.

### Fg = mg

Weight equation

### 9.81 m/s²

The "g" in the weight equation is this on earth.

### downward

Weight acts in this direction.

### 250 N

What is the gravitational force acting on a 5 kg object?

### Normal Force

The Force of a surface acting on an object

### perpendicular to surface

The direction Normal Force goes in

### friction

the resistance that one surface or object encounters when moving over another

### applied force

Friction opposes this.

### static and kinetic

Two types of friction

### static

This friction is resistive at rest (keep something from moving)

### kinetic

This friction is the resistive force on an object in motion).

### Parallel to surface, direction of motion

Friction moves in this direction, but is opposite of this.

### Coefficients of Friction

This is the ratio of the force of friction on an object to the normal force acting on the object.

Example: