Newton's Laws

According to Newton's First Law, an object at rest will stay at rest and an object in motion will stay in motion

An object's resistance to moving is called Inertia

Mass refers to the amount of Matter in an object, and is measured in Kilograms (Kg)

Mass

Force is the amount of pulling or pushing occurring on an object, which is measured in Newtons (N)

Force

Force & Mass

The Relation

Force, Mass and Acceleration are all Linked!

Newton found that Mass and Acceleration directly impact Force, and the same goes the other way!

He represents this relationship in the Formula F=MA

First Example

Say we have a large box!

This box has a mass of 20 kg and is moving at 2 m/s. What is the force exerted on the box?

Second Example

Much of the time, we have to rearrange the equation

A dog on a skateboard is rolling down the hill with a force of 55 N. The dog has a mass of 5 kg. What is the acceleration of the dog?

Net Force

• Net force takes into consideration both the direction and the amount of forces in each direction

• When both forces are going in the same direction, you add forces!

• When the forces oppose each other, you subtract them!

• This occurs when both forces on each side are NOT EQUAL

• The object WILL MOVE
  
  

Unbalanced Force

• This occurs when both forces on each side are EQUAL

• The object will NOT MOVE

​Balanced Force

Balanced & Unbalanced

Finding Acceleration and Mass

Utilize F=MA with ONLY THE NET FORCE

• After finding the net force, use F = MA to determine the missing A or M.

• Ex: Find the acceleration of a box with a mass of 10 kg.