LEANR THESE PHYSICS DEFINITIONS

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28 Terms

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Acceleration
The rate of change of velocity.
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Work-energy theorem
The work done by a net force on an object is equal to the change in kinetic energy of the object.
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Newton's Second Law
When a net force is applied to an object with mass, the object accelerates in the direction of the net force. The acceleration is directly proportional to the net force and inversely proportional to the mass.
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Impulse
The product of the net force and the contact time.
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EMF
The total energy supplied per coulomb of charge by the cell.
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Law of conservation of linear momentum
The total linear momentum of an isolated system remains constant.
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Threshold frequency
The minimum frequency of incident radiation at which electrons will be emitted from a particular metal.
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Work function
The minimum amount of energy needed to emit an electron from the surface of a metal.
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Coulomb's Law
The force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
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Frictional force
The force that opposes the motion of an object and acts parallel to the surface with which the object is in contact.
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Lenz's Law
The induced current flows in a direction that sets up a magnetic field to oppose the change in magnetic flux.
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Electric field (at a point)
The force experienced per unit positive charge (+1 C) at that point.
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Velocity
The rate of change of displacement.
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Resistance
A material's opposition to the flow of electric current.
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Power
The rate at which work is done.
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Faraday's Law of electromagnetic induction
The emf induced is directly proportional to the rate of change of magnetic flux (flux linkage).
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Ohm's Law
The current through a conductor between two points is directly proportional to the potential difference across it, at constant temperature.
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Principle of conservation of mechanical energy
In the absence of air resistance or any external forces, the mechanical energy of an object is constant.
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Newton's Law of Universal Gravitation
Every particle with mass in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
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Potential difference
The work done per unit positive charge.
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Electric current
The rate of flow of charge.
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Magnetic flux linkage
The product of the number of turns on the coil and the flux through the coil.
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Displacement
The change in position from the initial to the final position.
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Speed
The rate of change of distance.
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Work done on an object by a force
The product of the displacement and the component of the force parallel to the displacement.
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Newton's Third Law
When object A exerts a force on object B, object B simultaneously exerts an equal and opposite force on object A.
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Weight (gravitational force)
The force of attraction exerted by a planet on an object.
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Gravitational field
The force experienced per unit mass.