Definitions Flashcards
Law of Universal Gravitation
Each particle with mass in the universe attracts every other particle with a force which is directly proportional to the product of the masses and inversely proportional to the square of the distance between their centres.
Gravitational Field
The gravitational force acting per unit mass
Weight
The Gravitational force that Earth exerts on any object on or near its surface
Vector
a physical quantity that has both magnitude and direction (force)
Scalar
a physical quantity that has magnitude only (mass)
Ff
The force that opposes the motion of an object and acts parallel to the surface with which the object is in contact.
Resultant Vector
The single vector which has the same effect as the original vectors acting together
Fn
The perpendicular force exerted by a surface on an object in contact with it.
Newtons 1st Law
An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force.
Inertia
The property of an object that causes it to resist a change in its state of rest or uniform motion
Newtons 2nd Law
When a net force, Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass.
Newtons 3rd Law
When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A.
Columbus Law
Two point charges in free space or air exert forces on each other. the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between the charges.
Electric field
An electric field is a region of space in which a charged object will experience an electrostatic force.
Magnitude of Electric field
Force per unit positive charge where E and F are vectors
