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...