Flocabulary Energy

Grass and plants get energy from

• the sun.

• eating food.

• electrons.

Tags

NGSS.MS-LS1-6

Energy that comes from the heat inside the Earth is called ________ energy.

• solar

• geothermal

• kinetic

• potential

Potential energy is

• energy from electrons.

• energy that's stored.

• energy that can be created.

Tags

NGSS.MS-PS3-2

According to the law of conservation of energy, energy can't be created or destroyed, just used and converted into different forms. The amount of energy in a system does not change. For example, when a creature dies, the chemical energy in its muscles and blood becomes nutrients that feed the earth. But we are not able to use all of the energy we receive. For example, some energy is wasted as friction between the moving parts of machines; some energy may be converted into thermal energy and radiated into the air, which we can't use. Today, we are faced with the problem of finding the best sources of energy for us to use with the least amount of waste.

We divide our energy resources into two categories: renewable and nonrenewable. Nonrenewable energy resources are those that we can't easily replace. For example, that chemical energy from plants stored as petroleum, natural gas or coal is called fossil fuels. As their name implies, fossil fuels took millions of years to produce; they're nonrenewable because we can't wait millions of years to produce more.

• they are more likely to produce excess thermal energy that we can’t use.

• there is a limited supply of them and we can’t make any more.

• there is a possibility of finding dinosaur bones in petroleum or coal deposits.

Tags

NGSS.HS-ESS3-1

NGSS.HS-ESS3-2

Geothermal energy is energy that comes from the heat found inside Earth's crust. Like the sun, nuclear reactions deep inside the Earth generate thermal energy. Where it can be found close to the surface of the crust, geothermal energy is almost unlimited; however, it is only found at thin points in the crust, in areas prone to volcanoes and earthquakes.

Which of the following describes geothermal energy in use?

• Innovators are working to create panels to replace asphalt on highways, so roadways can generate energy from the sun even as cars burn fossil fuels

• Iceland is situated on top of multiple volcanoes and harnesses this natural power to heat the roads and sidewalks in the winter.

• A

  A drought in recent years has lowered the amount of hydroelectric power produced by the Hoover Dam.

Tags

NGSS.MS-ESS3-4

Potential energy is stored energy. An object has potential energy if it's able to move and thus capable of doing work. A stretched rubber band has potential energy, as does a gymnast standing on a balance beam and a water balloon held out a window.

Which of these objects has kinetic energy?

• a skateboard rolling up a ramp

• a car parked on top of a hill

• a dish placed near the edge of a table

• a rollercoaster not in use

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Chemical energy is the energy stored in the chemical bonds that hold molecules together. It's a form of potential energy, and can be used when these chemical bonds are altered. Consider your digestive system. After a meal, chemicals are released in your body to break down the molecular bonds in the food you ate. This releases the chemical energy that was stored in the food, thus powering your muscles, warming your body and allowing you to move. Chemical energy stored in wood can be converted to thermal energy by burning the wood.

How do we get energy from the food we eat?

• The constantly moving molecules in food give us kinetic energy.

• Breaking the molecular bonds in the food releases stored chemical energy.

• Eating hot food transfers thermal energy to our bodies.

• The chemical energy stored in the food is transferred to us as thermal energy.

Tags

NGSS.MS-LS1-7

True or False: Energy can be created.

• True

• False