# Reviewer in Physics

Essay by Shananigaaaans October 2014

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REVIEWER IN PHYSICS

KINEMATICS - study of motion

*Distance - length of the line following the object's path; a scalar quantity

*Displacement - change in the object's position; a vector quantity

Displacement = final position - initial position

*Average speed - distance travelled by an object over the time elapsed; a scalar quantity; (m/s)

Average speed = distance/time

*Instantaneous speed - speed of the object at an instant of time; a scalar quantity; (m/s)

*Average velocity - displacement of the object over the time elapsed; a vector quantity; (m/s)

Average velocity = displacement / time

*Instantaneous velocity - velocity of an object at an instant of time; a vector quantity; (m/s)

*Acceleration - change in an object's velocity; a vector quantity; (m/s2)

LAWS OF MOTION (Isaac Newton)

First Law of Motion/ Law of Inertia - "states that an object in a constant state of motion will remain in this state unless it is acted upon by a net force"

*inertia - the resistance of an object to a change in its state of motion

*mass - a measure of inertia; it is a quantity of matter in a given body

Second Law of Motion/ Law of Acceleration - "states that the net force acting on an object is equal to the object's mass times it's acceleration ";

Third Law of Motion/ Law of Interaction - "states that for every action there is an opposite and equal reaction"

CIRCULAR MOTION - the motion of a body along a circular path; a special case of circular motion is rotational motion

Quantities used to describe circular motion:

Period (T) - the time required for a body moving in circular path to make one complete cycle or revolution; unit: second (s)

Frequency (f) - the number of cycles or revolutions per second; unit: Hertz...