# Physics Regents Review

Joules
When using the equation Ephoton= hf = hc/wavelength, Ephoton must be in

1 Kg
is equal to 2.2 pounds

A nickel

Displacement
the change in position of an object

Resultant Vector
the vector sum of two or more vectors (a^2 + b^2 = c^2

Inertia
equal to the mass of an object

Power
measured in watts

Energy
measured in Joules

Energy in a Circuit
is equal to power (ohm’s law) x time

Strong Force
holds together particles of the nucleus

Weight (Force of Gravity)
decreases as you move away from the earth by distance squared

Constant Velocity or Zero Velocity
means the net force is zero and the acceleration is zero

Vectors
Velocity displacement, momentum and force are

Scalar Quantities
Speed, distance, time, and energy are

Acceleration
is the slope of a velocity-time graph

Velocity
is the slope of a distance-time graph

Momentum
is conserved in all collision systems

Magnitude
how large a vector quantity is

Mechanical Energy
is the sum of the potential and kinetic energy

An eV
is an energy unit equal to 1.6 x 10^-19 Joules

Gravitational Potential Energy
increases as height increases

Kinetic energy
changes only if velocity changes

Coulomb
is a charge

Amp
is current (coulomb/sec)

Volt
is potential difference (joule/coulomb)

Best conductor
short, fat, cold wires

Electron and Protons
have equal amounts of charge (1.6 x 10^-19)

decreases the total resistance of a circuit

increases the total resistance of a circuit

All resistors in series
have equal current (I)

All resistors in parallel
have equal voltage (V)

If two charged spheres touch
add the charges and divide by 2 to find the final charge on each sphere

Electric Fields
point in the direction of the force on a positive test charge

Electric fields between parallel plates
are uniform in strength except at the edges

Direction of a magnetic field
is defined by the direction a compass needle points

Sound waves
are longitudinal and mechanical

All angles
are measured to the normal

Light waves
are transverse

At the critical angle
a wave will be refracted 90 degrees

Doppler Effect
a wave source moving toward you will generate waves with a shorter wavelength and higher frequency

Transverse waves particles
vibrate back and forth perpendicular to the wave direction

Photon
is a particle of light

Electromagnetic waves
originate from accelerating charged particles

Ground State
is the lowest energy state of an atom

Internal Energy
is the sum of the temperature (KE) and phase (PE) conditions

Nuclear Forces
are strong and short ranged