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Level 62

Work, Energy, Power & Gravity


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Work formula
Work = force × distance
Earth's gravity
Work is lifting a load against _______
How quickly work gets done
Power is _______
Energy
(physics) the capacity of a physical system to do work
Power formula
Power= work done/time interval (P=w/t)
Watt (W)
SI unit Power
Kilowatt (1,000 watts)
kW is the abbreviation for a _______
Megawatt (1,000,000 watts)
MW is the abbreviation for a _______
Potential Energy
(mass) x (g) x (height)
kinetic energy
a running dog
Kinetic energy formula
KE= 1/2 mass x speed squared (1/2mv^2)
Potential energy formula
PE= mass x gravity x height
GPE=weight x height
Gravitational potential energy formula
work-energy theorem
The energy associated with the work done by the net force does not disappear after the net force is removed (or becomes zero), it is transformed into the Kinetic Energy of the body.
Conservation of Energy
Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes
Efficiency
_______ compares the amount of output work to the input work.
Efficiency formula
Efficiency= work done/energy used
The sun
The source of almost all energy on Earth
combustion
a process in which a substance reacts with oxygen to give heat and light
Tangential velocity
A velocity parallel to the Earth's surface
pulls
Everything _______ on everything else
Law of Universal Gravitation
a force of gravity that's acts on all objects in the universe
Law of universal gravitation in simpler terms
Everything pulls on everything else with an equal force
Inverse-square law
The intensity of light gets less as the inverse square of the distance
greater; less
The _______ the distance from the Earth's center the _______ the gravitational force on an object
Universal gravitational equation
F= G (mass1 x mass2/ distance squared)
Universal Gravitational Constant
F=g(m1m2/r^2) G = 6.67 E-11 N m² / kg²
Gravitational pulls
Ocean tides are the result of differences in _______
Spring tides
Tides that occur when the Sun, Earth, and Moon are all lined; High tides are higher than average and low tides are lower than average
Neap tides
a tide that occurs when the moon is halfway between a new moon and a full moon, in either direction; the tides due to the sun and the moon partly cancel, so that the …
The Big Bang
The explosion of a primordial fireball some 8 to 15 billion years ago which created the universe
Dark matter
Mysterious, invisible matter unlike the matter we know
The Big Crunch
The contraction of the universe, estimated to happen in 100 billion years
Machines
Devices to multiply forces
Work input=
Work output