Joules

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

1 Kg

is equal to 2.2 pounds

A nickel

weighs about 5 grams

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)

Adding a resistor in parallel

decreases the total resistance of a circuit

Adding a resistor in series

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