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# PS Chapter 5:Dynamic

### PS Chapter 5: Dynamics Coach Leach

TermDefinition
Dynamics The study of forces and how forces interact with matter, including their effects on an object's motion.
Force A push or a pull on a system.
Contact Force A force that acts between systems only when one system touches another.
Field Force A field in which a force vector exists at every point in the field.
Inertia The tendency of any kind of matter to resist change in its motion.
Law of Inertia Objects at rest remain at rest and objects in motion continue in a straight line at a constant speed unless acted on by a net external force.
Law of Accelerated Motion The acceleration of a system is directly proportional to the net force acting on the system and is inversely proportional to the system's mass.
Law of Action Reaction For every external force exerted on a system by its surroundings, the system exerts an equal but opposite force on its surroundings.
Friction A contact force that opposes the movement of objects past each other.
Law of Universal Gravitation The force of gravity between two objects is directly proportional to the products of their masses and inversely proportional to the square of the distance between their centers of mass
Free Fall The condition of an object accelerated by the force of gravity alone with no other external forces acting on it. It can only occur in a vacuum.
Drag A form of friction exerted by a fluid on an object moving through the fluid or as the fluid flows around the object.
Newton The standard SI unit we use to measure force.
Compression Force A type of contact force where two objects are being pressed together from opposite directions.
Tension Force A type of contact force where an object is being stretched in opposite directions.
Torsion Force A type of contact force where two object are connected using rotating forces in opposite directions.
Parachute A device that increases the drag on a falling object to slow down the objects rate of decent.
Galileo Ramp A device constructed to allow spherical objects to roll down them in order to measure the effects of gravity on falling objects.
Net Force The sum of all external forces acting on a system.
Balanced Force Any force that in combination with other forces acting on the same system produces a zero net force on the system.
Created by: CoachLeach