04.25.24 EAS Laws of Conservation

Open Ended

What is your best definition of energy?

Energy

• "is the capacity to do work"

• measured in Joules (J) (pronounced like jewels)

• comes in many different forms/types

• CANNOT be negative

Potential Energy

Kinetic Energy

Multiple Choice

A slower particle has a lower energy than an identical, faster particle.

• True
• False

Multiple Choice

Which type of energy has to do with objects in motion?

• Potential

• Kinetic

Multiple Choice

At which point of the roller coaster is potential energy the greatest?

• W

• X

• Y

• Z

Multiple Choice

High temperature is connected to:

• Low kinetic energy.
• High kinetic energy.
• Zero net energy.
• Equal kinetic energies.

​The higher you swing the most potential energy, when you swing down it is transformed to kinetic energy

Riding the Swings​

Chemical Potential Energy from the gasoline transforms to kinetic energy when the car moves ​

Car Engine ​

Energy Being transformed from one form to an another ​

Law of Conservation of Energy/ 1st Law of Thermodynamics​

• Energy​ can never be created nor destroyed but can be transformed into other forms

MUST REMEMBER!!​

1. Energy cannot be destroyed

2. Energy cannot be created

3. ​Energy can ONLY be transformed from one form to a another

The sum of the kinetic energy and potential energy is equal to mechanical energy​

ME= mechanical energy

KE= kinetic energy

PE= potential energy ​

​

ME= KE + PE

Energy= ​is the ability to change

Total energy of a closed system is conserved, which is known as mechanical energy​

Law of Conservation Energy ​

MECHANICAL ENERGY​

​Mechanical energy(total energy) remains the same even when it transforms from potential energy to kinetic energy.

Some text here about the topic of discussion

2nd Law of Thermodynamics

The 2nd law states that “whenever energy changes form, some of it is always converted to thermal waste energy (heat) & released" to the surroundings

Unusable energy = entropy; a measure of the disorder in a system.

What is HEAT?

Multiple Choice

Thermal energy leaves my hand and warms the ice cube I am holding.

The movement of thermal energy is always from a __?__ object to a __?__ object

• from cooler object to a warmer object

• from warmer object to a cooler object

Multiple Choice

Which statement is true about ENTROPY?

• Entropy refers to DISORDER, the unusable energy that escapes a system.
• Entropy refers to the balance of temperature among two or more systems.
• Entropy refers to the average kinetic energy of the molecules.
• Entropy refers to the inability to destroy or create energy. 

Waste Energy is Heat Energy

The Heat Energy released from your car is WASTE energy (thermal), a product of every energy transformations.

(Energy in gas - some converts to mechanical energy and some to thermal energy)

Multiple Choice

When energy changes form, some energy is always "lost" to heat.

• TRUE

• FALSE

Multiple Choice

What is thermal pollution?

• Heat released to the air & water, causing changes

• Heat used to warm up a cold area.

• A product of radiant light energy

• Pollution caused by broken thermometers

Multiple Choice

Which direction will the heat flow while this ice cap melts?

• there is no heat transfer
• from the icecap to the water
• from the water to the icecap

Open Ended

Provide an example of the Law of Conservation of Energy in action AS WELL AS an example of the Law of Conservation of Matter in action.