Total Mechanical Energy

Q. What does the Law of Conservation of Energy state?

• Energy can be created but not destroyed.

• Energy can be created and destroyed.

• Energy cannot be created but can be destroyed

• Energy cannot be created or destroyed.

Tags

NGSS.MS-PS3-5

Q. What has to be true about an object for it to have kinetic energy?

• it must be moving

• it must be experiencing a net force

• it must be elevated

• it must be accelerating

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Does your desk have kinetic energy right now? Explain and justify your answer.

• yes because it is sliding across the room right now

• yes because it has someone sitting in it

• no because it is not moving

• no because it is here on earth

Tags

NGSS.MS-PS3-5

What is potential energy?

• the energy an object has due to its position or condition

• the energy an object has due to its chemical composition

• the energy an object has due to its motions

• the energy an object has due to its atomic structure

Tags

NGSS.MS-PS3-2

When does an object have no kinetic energy?

• when it is moving very slowly

• when it has no electrical charge

• when the only force that is acting on it is gravity

• when it is at rest

What is an example of potential energy?

• A book sitting on a shelf

• A person playing basketball

• A car moving down the highway

• Both B and C

Tags

NGSS.MS-PS3-2

If you are at the top of a roller coaster and your potential energy is 145 J, what is your Kinetic Energy at the bottom of the roller coaster?

• 290 J

• 92.5 J

• 145 J

• 0 J

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student decides to take up diving as a hobby. He stands on a high-dive that is 4m tall. If the student has a mass of 50 kg, what is his PE? Select ALL of your givens.

• Potential Energy

• Mass

• Gravity

• Height

A student decides to take up diving as a hobby. He stands on a high-dive that is 4m tall. If the student has a mass of 50 kg, what is his PE? What are you solving for?

• Potential Energy

• Mass

• Gravity

• Height

Tags

NGSS.MS-PS3-2

A student decides to take up diving as a hobby. He stands on a high-dive that is 4m tall. If the student has a mass of 50 kg, what is his PE? Which equation are you going to use?

• PE = mgh

• KE = 1/2 (m) (v^2)

• W=fd

• TME = KE + PE

Tags

NGSS.MS-PS3-2