What is Newton's first law?

An object continues in its state of rest or of uniform velocity in a straight line as long as no net force acts on it.

What is inertia?

The tendency of an object to remain at rest

How is inertia measured?

mass (kg)

What are some real world examples and applications of Newton's first law?

A ball at rest in a moving car will roll forward when the car stops because of inertia.

What is mass?

The measure of inertia in an object and the measure of the quantity of matter in an object

What is Newton's second law?

Acceleration is directly proportional to the net force acting on it and is proportional to mass. Direction of acceleration is in the direction of net force.

What is the relationship between force, mass, and acceleration?

ΣF=ma

What does it mean when the sum of the forces acting on a body are zero?

There is no acceleration

What is the weight of an object?

F_g=mg

What is the normal force?

The force between an object and a surface perpendicular to it

What is the relationship between normal force and weight of an object?

F_N=mgcosθ

What is Newton's third law?

Every action has an equal and opposite reaction

F_AB= -F_BA

What is an interaction pair?

 Why dont the forces cancel out?

Two forces acting on each other don't cancel out because there is more than one force acting on each object

What is friction?