Level 62 Level 64
Level 63

Work, Energy, Power & Waves


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Positive
If ΔΗ° is _______, energy is absorbed when the compound is formed from pure elements. Less stable than its constituent elements. Endothermic
Negative
If ΔΗ° is _______, energy is released when the compound is formed from pure elements. Is more stable than its constituent elements. Exothermic.
force
(interactions between two objects)
Joule
unit of measurement for work and energy
Energy
(physics) the capacity of a physical system to do work
Because the barbell is motionless.
Explain why work is NOT done on a barbell with a weight lifter is holding the barbell over his head.
work
a force acting upon an object to cause a displacement. (key words: force, displacement, and cause)
Watt
A measure of power equal to one joule of work per second.
746
1 Horsepower = _______ Watts
Power
(physics) the rate of doing work
What is energy?
The ability to do work.
Joules
Potential energy is measured in units of_______.
Kinetik
Energy of motion is called?
KE = 1/2mv^2
The equation for energy of motion is?
Potential
Energy of position is called?
PE = mgh
The equation for energy of position is?
elastic potential energy
a stretched bungee cord
Height and Mass
An objects gravitational potential energy depends on its _______, its _______, and the acceleration due to gravity.
mechanical
A generator converts _______ energy into electrical energy.
Created, destroyed, and Forms
According to the law of conservation of energy, energy can never be _______ or _______, it can only change _______.
Wave
A disturbance in matter that carries energy from one place to another is called a _______.
medium
A substance through which signals can travel (e.g. air for sound waves).
Electromagnetic
_______ waves do not need a medium to transfer from one place to another.
Transverse
Side to side axis
Crest and Trough
The highest point of a wave above the rest position is called the _______ - and the lowest point below the rest position is the _______.
Longitudinal
A wave in which the vibration of the medium is parallel to, or in the same direction as, the direction in which the wave travels is called a _______
Perpendicular
A wave in which the vibration of the medium is _______ to the direction in which the wave travels is called a transverse wave.
Rarafraction
A _______ is a region in a longitudinal wave where particles of a medium spread out.
period
The time required for one complete revolution.
Frequency
#cycles/second
HZ
What is the unit for frequency?
sec
What is the unit for period?
M.
What is the unit for wavelength?
Lamda
What is the symbol for wavelength?
Wavelength
distance between two consecutive crests which are in phase with one another
amplitude
The amplitude of the oscillation is the parameter that varies with time and this resides on the y-axis of the oscillation graphs. In figure 1, the amplitude of the oscillation is the displacement of…
reflection
a wave strikes a boundary and bounces back
Diffraction
the bending and spreading of waves, usually around an obstacle
refraction
a wave is bent due to a change in speed
Interference
the combination of two or more waves that results in a single wave