Newtons Second Law of Motion

What is the subject of this law ?

Acceleration

On Newtons second law, what are three things stated about the Acceleration of an object.

A proportional to F, A inversely proportional to 1/m, acceleration is on the same direction as the net force

What is the equation that describes the net force ?

F=ma

What does this equation demonstrate

(F=ma) …..

The second law can be used to find the size of the net force needed to give a certain mass a certain amount of acceleration

if the size of the mass you want to accelerate increases……….

so does the amount of force required

If the size of the acceleration you want to give the mass increases ……….

So does the amount of force required

What is then conditio of an object during Newtons second law ?

When forces are acting

What is the Unit for Force ?

A Newton

What is 1 Newton ?

The amount of force necessary to give a 1kilogram object an acceleration of 1 m/s/s

If you wanted to accelerate a 2kg mass at 1m/s/s….

2 newtons would be needed since you have twice the inertia and twice the resistance to the change in motion

If you wanted to give a 2kg object an acceleration of 2m/s/s

4N would be needed as twice the amount of inertia would resist four times as much

In your Ipad, compare the two equations: F = ma and W = mg ….

• Both deal with a force acting on a mass and giving it some acceleration

• F refers to any force while W refers to weight

• A refers to any acceleration while g reffers to acceleration due to gravity in free-fall

• F=ma is a general relashionship that applies to any force acting on any object, while W=mg applies to objects in free-fall

What are the types of forces ……

Wheight, Normal, Friction, Drag, Thurst, Spring Tension, Lift, Tension

What is a Free-Body Diagram ?

A tool that helps apply Newtons Second Law to a moving object in the attempt to predict its motion