MECHANICAL: Energy Transfers & Equations

An energy equation is usually written as

• 
• 

Energy equations allow us to determine

• the energy efficiency of a a machine

• how much energy is wasted

• how energy changes when using an appliance /machine

• how much energy comes out of an appliance / machine

If we trace back all energy we use each day, we find it comes from

• kinetic energy

• potential energy

• the sun

Tags

NGSS.HS-ESS1-1

NGSS.HS-LS1-5

The energy equation for the FIRST conversion for the steam engine is

• 
• 
• 
• 

A bus engine transfers chemical potential energy into ____ so that the bus moves.

• thermal energy

• gravitational potential energy

• electrical energy

• kinetic energy

Which are the forms of kinetic energy?

• mechanical, sound, thermal, nuclear, chemical
• sound, radiant, thermal, mechanical
• sound, thermal, mechanical, chemical
• sound, thermal, nuclear, chemical

List the energy transformations for a hair dryer.

• electrical, mechanical, thermal
• electrical, sound, radiant
• mechanical PE, mechanical KE, electrical
• chemical, thermal, mechanical KE

Energy transformations occur when...

• energy is created through conduction
• energy changes from one form to another
• two forces slide together that are touching
• a chemical reaction takes place

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which energy conversion is taking place when you put gasoline in a car?

• thermal -> electrical
• mechanical -> electrical
• chemical -> mechanical
• mechanical -> electromagnetic

The picture showing the energy conversion

Chemical → heat

is:

• 
• 
• 
• 

Tags

NGSS.MS-PS1-6