Mechanical Energy Challenge

What are the two main types of mechanical energy?

• Kinetic energy and potential energy

• Frictional energy and nuclear energy

• Chemical energy and electrical energy

• Thermal energy and sound energy

Tags

NGSS.MS-PS3-2

Give an example of an object with kinetic energy.

• sleeping cat

• motionless tree

• moving car

• stationary rock

Tags

NGSS.MS-PS3-1

Provide an example of an object with potential energy.

• still ball

• dropped book

• empty cup

• stretched rubber band

Tags

NGSS.MS-PS3-2

Explain what happens during energy transformation.

• Energy remains constant in one form

• Energy changes from one form to another

• Energy is created out of nothing

• Energy can be destroyed

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

How is mechanical energy conserved in a system?

• Mechanical energy is conserved when the system is at rest.

• Mechanical energy is conserved in a system when there is no external work done on the system.

• Mechanical energy is conserved when there is friction in the system.

• Mechanical energy is conserved when the system is in motion.

Tags

NGSS.MS-PS3-5

Define kinetic energy and give an example.

• Kinetic energy is the energy stored in an object at rest. An example is a stationary rock.

• Kinetic energy is the energy of an object due to its temperature. An example is a hot cup of coffee.

• Kinetic energy is the energy an object possesses due to its motion. An example of kinetic energy is a moving car.

• Kinetic energy is the energy of an object due to its position. An example is a hanging pendulum.

Tags

NGSS.MS-PS3-1

Describe potential energy and provide an example.

• Kinetic energy is the energy an object has due to its motion. For example, a stationary rock has kinetic energy.

• Potential energy is the energy an object has due to its position or state. For example, a stretched rubber band has potential energy.

• Potential energy is the energy an object has due to its temperature. For example, a hot cup of coffee has potential energy.

• Potential energy is the energy an object has due to its color. For example, a red ball has potential energy.

Tags

NGSS.MS-PS3-2

How does energy change form in a roller coaster ride?

• Potential energy is converted to kinetic energy and vice versa as the coaster moves up and down hills.

• Potential energy is converted to thermal energy

• Kinetic energy is converted to light energy

• Potential energy is converted to sound energy

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Why is it important to conserve mechanical energy?

• To ensure the total amount of energy in a system remains constant and to promote energy efficiency.

• To increase the cost of energy production

• To promote the use of renewable energy sources

• To decrease the efficiency of machines

Tags

NGSS.MS-PS3-5

How can you calculate the total mechanical energy of an object?

• Total mechanical energy = Force x Distance

• Total mechanical energy = Mass x Acceleration

• Total mechanical energy = Work + Power

• Total mechanical energy = Kinetic energy + Potential energy