Welcome to Physical Science

Inertia The Tendency of things to resist changes in motion

Newtons Laws First Law – Every material object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by a force impressed upon it.

Mass – measure of the quantity of matter 1 KG = 9.8 Newton's

Newton's Laws Second Law – The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass A = F / M

Force A Push or a Pull Gravitational, Electrical, Magnetic, Muscle effort A force is anything that accelerates an object

When Acceleration is Zero State of mechanical equilibrium All forces acting on an object are canceled out Zero acceleration does not mean zero velocity

Free Fall F = MA so A = F/M A more massive object will have a greater attraction to the earth but because of inertia will speed up slower A less massive object will have a smaller attraction to the earth but will speed up faster Both objects will hit the ground at the same time

Free fall – terminal speed Pictures from: Physical Science – Hewitt, Suchocki, Hewitt

Newtons Laws Third Law – Whenever an object exerts a force on a second object, the second object exerts and equal and opposite force on the first