Physical Physical QuantitiesQuantities

Instructions

• In the slides that follow, a definition or description of a physical quantity is given. You must name the quantity and state it’s SI units.

• This tells how much “stuff” an object is made of. It also provides a measure of an object’s inertia, and determines its gravitational interactions.

• Mass• kg

• The force per unit charge that would be experienced by an object at a particular location.

• Electric Field• Newtons per

Coulomb OR Volts per meter

• The force per unit area exerted on a surface

• Pressure• Pascals

• The rate at which charge flows in a wire or circuit

• Electric Current• Amperes

• A push or a pull • Force• Newtons

• How tightly matter is packed. Mass per unit volume.

• Density• kg/m3, g/mL

• The amount of charge per volt stored by a device.

• Capacitance• Farads

• The amount of energy per unit charge

• Electric potential (or voltage)

• Volts

• Vector quantity equal to the product of an object’s mass and velocity.

• Momentum• Kg-m/s or N-s

• A force acting at a distance that tends to cause a rotation.

• Torque• Newton-meters

• The amount of time it takes something to complete one full cycle.

• Period• seconds

• Ratio of the speed of light in vacuum to the speed of light in a transparent medium. It determines the refractive (bending) properties of the material.

• Index of refraction• No units

• Property that measures how difficult it is for charge to flow in a circuit.

• Resistance• Ohms

• The number of magnetic field lines that pass through a surface.

• Magnetic Flux• Webers (or T-m2)

• The rate at which an object’s velocity is changing.

• Acceleration• m/s2

• The number of oscillations per unit time.

• Frequency• Hertz

• A force that acts through a distance. One of the ways of adding or removing energy from an object.

• Work• Joules

• The magnitude of an object’s displacement.

• Distance• Meters

• Product of a force and the duration of time it is applied. It results in a change of momentum

• Impulse• N-s (or kg m/s)

• A vector field that can result in a force if a charged object moves through it.

• Magnetic Field• Tesla

• Property of a particle that determines its electrical interactions

• Electric charge• Coulombs

Section II -- Formulas

• In this section the name or description of a formula is given. You must be able to state the equation and explain what is represented by each letter in the formula.

• Newton’s Second Law

• Fnet=ma or F=ma

• Coulomb’s Law • Felec=kq1q2/r2

• Faraday’s Law • EMF=-N/t

• Magnetic field due to a long straight wire

• B=I/2r

• Ohm’s Law • V=IR

• Calculate power in an electric circuit

• P=IV or P=I2R

• Variation of resistance with temperature

• R=Ro(1+T)

• Force acting a current carrying wire in a magnetic field.

• F=BILsin

• Bernoulli’s Law • P+gh+1/2v2=constant

• Force acting on a charge in an electric field

• F=qE

• Find the charge stored on a capacitor

• C=Q/V

• How resistance depends on the geometry of a conductor

• R=L/A

• Electromotive force created by moving a wire through a magnetic field.

• V=EMF=BLv

• Snell’s Law • n1sin1=n2sin2

• Double slit interference

• dsin=n• Yn=nL/d

• Kinetic friction • Ff=kN

• Kinematics equation that leaves out time

• v2=vo2+2ax

• First law of thermodynamics

• U=Q-W

(where W is the work done BY the gas)

• Universal law of gravity

• Fg=GM1M2/r2

• Equivalence of mass and energy (used in pair production, pair annihilation and nuclear binding energies).

• E=mc2

• Capacitors in series • 1/Ceq=1/C1+1/C2…

• How capacitance of a parallel plate capacitor depends on geometry.

• C=oA/d

• Electric field due to a point charge

• E=kq/r2

• Force acting on a charge moving through a magnetic field.

• F=qvBsin

• Impulse momentum theorem

• Fnett=p

• Wave equation • v=f

• Lens-mirror formula • 1/f=1/do + 1/di

• Parallel component of an object’s weight on an inclined plane

• Fparallel=mgsin

• Gravitational potential energy on earth (or in a uniform gravity field)

• Ug=mgh

• Spring force • Fspring=-kx

• Energy of a photon • E=hf

• Energy levels of hydrogen atom

• En= -13.6 eV/n2

• Overall intensity of a blackbody

• P/A=T4

• Photoelectric effect • qV=hf-• KEmax=hc/-

• Electric potential in the vicinity of a point charge

• V=kq/r

• Energy of a charge accelerated through a potential difference

• E=qV

• Resistors in series • Req=R1+R2…

• Current along parallel branches of an electric circuit

• I1+I2+I3=Itotal

• How to calculate energy used by a device that is in operation for a certain amount of time.

• Energy=Power x time

• Kepler’s Third Law • T2/r3=constant

• Equation of continuity • A1v1=A2v2

• Spring potential energy

• Uspring=1/2 kx2

• Gravitational potential energy of two spherical masses separated by a distance.

• Ug= -Gm1m2/r

• Compton scattering • =he/mc(1-cos)