The Nature of Force.

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Presentation transcript:

The Nature of Force

Force-Push or Pull

Magnitude and Direction Forces are described by strength and direction

Unbalanced Forces Result in change of motion-acceleration

Balanced Forces Will not change object’s motion.

Newton’s First Law of Motion An object in motion will stay in motion and object at rest will stay at rest unless acted upon by a force. Also called the law of inertia.

Inertia Tendency for an object to resist a change in motion. Directly related to an object’s mass. The more mass the more inertia.

Force = Mass x Acceleration Kilograms x m/s/s = Newtons

Friction Strength of force depends on: Type of surface How hard the surface pushes together.

Uses of Friction Walking Driving Lighting match

Three types of Friction Sliding Friction Rolling Friction Fluid Friction

Gravity Force that pulls objects to Earth. When it’s the only force it is called free fall

Gravitational Acceleration 9.8 m/s/s is constant gravity acceleration for all objects. Final velocity is 9.8 m/s/s x time falling. (no air resistance)

Air Resistance Objects falling through air experience fluid friction called air resistance. Air Resistance increases with velocity. When velocity reaches maximum it is called terminal velocity.