Chapter Review- Energy

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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.


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