Kinetic Energy and Gravitational Potential Energy
What is kinetic energy?
Kinetic energy is the energy stored in moving objects.
What are the 3 properties of energy
-energy cannot be created
-energy cannot be destroyed
-energy is a scaler
What is the work-kinetic energy theorem?
w-KE =1/2mvf2 - 1/2mvi2
The particles of a liquid have ____________ than the particles of a gas do at the same
less mobility
What is the equation for kinetic energy?
KE=1/2mv^2
What is the SI unit for energy
Joule
if the displacement is in the direction opposite to the force, is the work done negative or positive.
negative
Water has higher surface tension than most other common liquids do because molecules at the surface of water
form hydrogen bonds with one another
What is the equation for gravitational potential energy?
GPE= Mass X Gravity X height
GPE=MGH
The 'time of flight' of a projectile, initially fired perfectly horizontal, is dependent upon which of the following
Its initial height
What is the first law of thermodynamics
"In any process in an isolated system, the total energy remains the same."
The process of ____________ occurs when the kinetic energy of the particles of matter decreases to the point at which attractive forces pull the particles into fixed positions.
solidification
What are 3 things that affect the gravitational potential energy of an object?
mass of the object, how high it is above the ground, and gravity (gravitational field strength).
In a circular orbit, the planet would have the same speed __________ in the orbit.
Everywhere
Energy can be divided into 2 parts ________________ and ___________________.
macroscopic and microscopic
Amorphous solids are sometimes called supercooled liquids because the particles of an amorphous solid
are not in an orderly, geometric
arrangement
A crane lifts a 75 kg mass a height of 8 meters. Calculate the gravitational potential energy gained by the mass.
G = 9.8 N/kg
GPE= 75 X 9.8 X 8
GPE= 5,880 J
The Law of Conservation of Mechanical Energy says that in the absence of non-conservative forces, such as friction, the total mechanical energy possessed by a system is conserved: TRUE OR FALSE
True
The First Law of thermodynamics is a restatement of the law of _______________________."
conservation of energy
State the kinetic-molecular theory of matter, and describe how it explains properties of matter.
particles of matter are always in constant motion