Conservation of Energy

What remains constant (stays the same) in a closed system?

• Kinetic energy

• Potential energy

• Total energy

• Mechanical energy

What does the Conservation of Energy principle state?

• Energy can only be converted into mechanical energy

• Energy is always lost when converted from one form to another

• Energy can neither be created nor destroyed, only transformed

• Energy can be created and destroyed

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

NGSS.HS-PS3-3

At the TOP of its swing on the pendulum, what Type of Energy is does the ball have?

• Thermal energy

• Kinetic energy

• Electrical energy

• Potential energy

Tags

NGSS.HS-PS3-2

What is mechanical energy (ME)?

• The energy produced by electrical charges

• The energy associated with the motion of particles

• The energy stored in chemical bonds

• The sum of kinetic energy (KE) and potential energy (PE)

Tags

NGSS.HS-PS3-2

What demonstrates the conservation of energy in a swinging pendulum?

• It stops swinging due to friction

• The sum of Potential Energy (PE) and Kinetic Energy (KE) remains constant
  PE1 + KE1 = PE2 + KE2

• Its kinetic energy is converted into chemical energy

  KE -> CE

• Its speed increases indefinitely

What equation represents the conservation of mechanical energy?

• mv^2 + mgh = 0

• E = mc^2

• KEintial + PEintial = KEfinal + PE final

  
  KE =1/2 mv^2

  PE = mgh

• KE + PE = ME
  
  KE =1/2 mv^2

  PE = mgh

Answer explanation

Conservation will always compare energy at different times (intial/final) to make sure energy is the same

Tags

NGSS.HS-PS3-1

What is the significance of the equation
KE + PE = 1/2 mv^2 + mgh?

• It calculates the speed of light

• It is used to calculate Electrical Energy

• It represents the Conservation of Momentum

• It shows the how to calculate total Mechanical Energy (ME)

Tags

NGSS.MS-PS3-1

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NGSS.MS-PS3-5

Why is friction negligible in the pendulum example?

• Because it increases kinetic energy

• Because it has a minimal effect on the system

• Because it adds to the total energy

• Because it does not exist

Which of the following is considered non-mechanical energy?

• Kinetic energy

• Elastic Potential Energy

• Gravitational potential energy

• Chemical Energy

What is the primary difference between mechanical and non-mechanical energy?

• Mechanical energy can only be found in moving objects

• Non-mechanical energy includes chemical, thermal, and nuclear energy

• Non-mechanical energy cannot be converted into other forms

• Mechanical energy is not conserved

Tags

NGSS.HS-PS3-2