2.1 - Introduction to Inertia and Inertial Mass
- Inertia
- Inertia is the tendency of an object to resist change in state of Motion (velocity).
- The change of Velocity in time is acceleration therefore inertia is the resistance to acceleration
- An object at rest will stay at rest because of its inertia. An object with constant velocity means constant speed and direction
- Inertial mass
- Measure of Inertia therefore the measure of an objects resistance to acceleration
- Forces the ability to cause change in state of motion of an object
- Force is a vector so it has a magnitude and a direction
- Force is resulted from an interaction between two objects
Field force and Contact Force: Contact force is the is force resulted from two interacting objects that touch while field force is resulted from interacting objects that do not have to touch.
2.3 How to form a Free body Diagram
- Free body diagram represents all the forces being acted on an object
2.4 Introduction to Newtons First Law
- An object at rest will stay at rest and an object in motion will maintain a constant velocity unless acted upon by a net external force
- Net means the sum, and external means the forces caused by an interaction with an object other than itself
- The more mass an object has the more inertia it has so the harder it is to change the objects direction
2.5 Introduction to the forces if Gravity and Gravitational Mass
- Force of Gravity = Fg = Weight
- Gravity is the attractive force between earth and an object
- Fg = mass x g
- m = Gravitational mass
- Gravitational mass = Inertial Mass (experimentally)
- g (earth) = +9.81 m/s^2
- Fg is a downward vector
- The unit for Fg is Newtons
- Newton Mechanics or Classical mechanics describe the motion of a large object moving at small speed relative to he speed of light
- English unit for force = Pounds (lbs)
2.7 Introduction to Newtons 2nd law
- ΣF = ma
- "Σ" represents sigma which means "sum of "
- The equation represents that Acceleration is inversely proportional to Force and directly promotional to Mass
- Connects Force equations and UAM equations
2.8 Force vs. Time a Dynamic Cart
2.9 A three Force example of Newtons 2nd Law with Components