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Welcome to Physical Science. Inertia The Tendency of things to resist changes in motion.

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Presentation on theme: "Welcome to Physical Science. Inertia The Tendency of things to resist changes in motion."— Presentation transcript:

1 Welcome to Physical Science

2 Inertia The Tendency of things to resist changes in motion

3 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.

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

5 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

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

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

9 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

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

11 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

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