Newton’s second law

Section 3.1

Warm up

What is acceleration?

How do we calculate acceleration?

Acceleration

An unbalanced force causes an object to accelerate.

What type of force is

represented in each of the

following figures?

The acceleration of an object is directly proportional to the net force

acting on the object…..…… the acceleration of an object is inversely proportional to the mass of

the object.

Relating net force, mass and acceleration…..

Newton’s second law of motion

Acceleration = Fnet

mass

Calculate the acceleration of the rock

Calculate acceleration

Calculate acceleration

Relation between acceleration and forces

Large Force = Large Acceleration

Fa

In other words….

In other words…..using the same amount of force….

Application ….

1- If the mass of a helicopter is 4500 Kg, and the net force on it is 18000N, what is the helicopter’s acceleration?

Application

2- what is the net force with a mass of 900 Kg if its acceleration is 32.0 m/s2?

Application

3- a car is being pulled by a tow truck. What is the car’s mass if the net force on the car is 3000N and it has an acceleration of 2.0m/s2?