Definitions Flashcards
State Newton’s Second Law.
When a resultant force acts on an object, the object will accelerate in the direction of the resultant force at an acceleration directly proportional to the force and inversely proportional to the mass of the object.
State Newton’s Law of Universal Gravitation.
Each particle in the universe attracts every particle with a gravitational force that is directly proportional to the product of their masses and inversely proportional to the squared distance between their centres.
Define what a vector is.
It is a physical quantity that has both magnitude and direction.
What is a resultant vector?
The vector sum of two or more vectors.
What is static friction?
The force that opposes the motion of a stationary object relative to the surface.
Define the term normal force.
The force or the component of a force which a surface exerts on an object it is in contact with, and which is perpendicular to the surface.
State Coulomb’s Law.
The magnitude of an electrostatic force exerted by two point charges on each other is directly proportional to the product of the magnitude of the charges and inversely proportional to the square distance between them.
State Ohm’s Law.
The potential difference across a conductor is directly proportional to the current in the conductor provided temperature remains constant.
Define the term internal resistance.
The opposition to the flow of charge with in a battery or cell.
What is Newton’s Third Law.
When object A exerts a force on object B, object B simultaneously exerts and equal and opposite force on object A.
Define Kinetic Friction.
The force that opposes the motion of a moving object relative to a surface.
Define emf.
The emf of a cell or battery is the total amount of energy supplied per coulomb of charge in a cell.
Define current.
The rate of flow of charge.
Define resistance.
The opposition to the flow of charge.
Define electric field.
A region in space in which an electric charge experiences a force.
