Chapter Review- Energy
Explain why a streamlined car generally will have better fuel economy than a boxy car with the same mass.
aerodynamics.
nutritionists use the ______ to measure how much energy we get from foods.
calorie
unit used to measure energy in food
calorie
the energy stored in foods and fuels is ________ potential energy.
chemical
energy stored in food and fuels
chemical potential energy
the law of ________ states that energy cannot be created or destroyed.
conservation
the total energy of a system remains ________.
constant
energy stored by this that stretch or compress
elastic potential energy
the ability to cause change
energy
causes some mechanical energy to change to thermal energy
friction
you convert kinetic energy into thermal energy when you rub two sticks together because of __________.
friction
energy stored by things that are above earth
gravitational potential energy
SI unit of energy
joule
A car engine changes chemical potential energy into the _________ energy so the car can move
kinectic
energy in the form of motion
kinetic energy
the conversion of potential energy to kinetic energy demonstrates the _______.
law
energy cannot be created or even destroyed
law of conservation of energy
Total amount of kinetic and potential energy in a system
mechanical energy
the potential energy of an object depends on its _______.
position
stored energy due to position
potential energy
an orange in a tree has ________ energy due to Earth puling down on it.
GPE
The amount of kinectic energy a moving object has depends on its mass and its_______.
velocity
A hammer falls off a roof and strikes the ground with a certain amount of kinetic energy. If it fell from a roof twice as tall, would its kinetic energy change? Explain.
yes, because it depends on its height. The GPE increases.