j Flashcards
(80 cards)
What is the Principle of a Potential Divider?
When two resistors are used in series, the input voltage is applied across both resistors and the output voltage is taken across one of them.
What is Superposition?
When at least two waves meet at a point, the resultant displacement is the algebraic sum of the displacement of each wave.
What does Kirchoff’s second law state?
The sum of the e.m.f.s is equal to the sum of the p.d.s in a closed loop.
What does Kirchoff’s first law state?
The sum of the currents entering any junction is always equal to the sum of the currents leaving the junction.
What is the Conservation of Charge?
The law that states that charges are neither created nor destroyed but only transferred from one material to another.
What is Ohm’s Law?
The current in a conductor is directly proportional to the potential difference across its ends provided that temperature remains constant.
What is the principle of superposition?
The idea that we can get the resultant wave from adding two waves at a point.
What is Malus’s Law?
The intensity of light is proportional to the (amplitude)^2. Transmitted intensity I=E^2.
What does Hooke’s Law state?
Extension is directly proportional to force until the spring reaches its elastic limit.
What is Archimede’s Principal?
The weight of the liquid displaced is equal to the volume of the object.
What does Newton’s Second Law (in terms of momentum) state?
The resultant force acting on an object is directly proportional to the rate of change of the linear momentum of that object.
What does Newton’s First Law (in terms of momentum) state?
The momentum of an object remains the same unless the object experiences an external force.
What is Newton’s Third Law of Motion?
When two bodies interact, the forces they exert on each other are equal in magnitude and opposite in direction.
What does Newton’s Second Law state?
For a body of constant mass, its acceleration is directly proportional to the resultant force applied to it.
What does Newton’s First Law state?
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
What is the principle of conservation of energy?
The total energy of an isolated system remains constant.
What is the Principle of conservation of momentum?
Total momentum of a system remains the same before and after a collision.
What is the Doppler effect?
An observed change in the frequency of a wave when the source or observer is moving.
What is displacement?
The total distance traveled in relation to a point in a particular direction.
What is distance?
The amount of space traveled by an object.
What is speed?
The rate at which an object moves.
What is velocity?
The speed of an object in a particular direction, the rate of change of displacement.
What is a scalar?
A physical quantity that has magnitude only.
What is a vector?
A quantity that has magnitude and direction.