Energy
Kinetic Energy
Potential Energy
Law of Conservation of Energy and other
Energy Transformations
100
What unit is energy measured in?
Joule
100
What is Kinetic Energy?
energy in the form of motion.
100
What is potential Energy?
stored energy due to position
100
What is the law of conservation of energy?
energy cannot be created or destroyed
100
A car engine changes chemical energy into _____ energy so the car can move.
kinetic or mechanical
200
What is the ability to cause change?
Energy
200
What is the formula for kinetic energy?
KE=1/2mv2
200
What is the formula for potential energy?
GPE= mgh
200
If a coconut falls from a tree, what happens to the mechanical energy from start to finish.
stays the same
200
What is the transformation of a toaster making toast.
electrical to thermal
300
Other than Kinetic and Potential, name 3 other forms of energy.
electrical, mechanical, thermal, chemical, elastic, gravitational
300
What two things does kinetic energy depend on?
mass and velocity
300
What two things does potential energy depend on?
mass and height
300
What is elastic potential energy?
energy stored that in things that are stretched or compressed.
300
What is the transformation whrn a plant falls from a window?
potenial to kinetic
400
What is kinetic energy plus potential energy?
Mechanical Energy
400
Kinetic energy of an object increases as its _________ increases.
velocity
400
As height increases, what happens to potential energy?
increases
400
What is chemical potential energy?
energy stored in food.
400
Green plants convert light eneergy from the sun into _______ energy.
chemical
500
The total mechanical energy in a system remains the _________________
same
500
Calculate the Kinetic energy of a 30 kg cart moving at a speed of 6m/s.
540J
500
T/F Two copies of the same book are in a book case. ONe book is twice as high as the other. They have the same potential energy.
false
500
If a ball had a kinetic energy of 1500J and a velocity of 4 m/s, what is its mass?
187.5 kg
500
What is the transformation of a placekicker sending a football through the uprights of a goalpost? (think about the kickers body only, not the action with the ball)
chemical to mechanical
M
e
n
u