Evaluation: Conservation of Mechanical Energy

Which of the following is true of the conservation of energy in a closed system?

 

• A. Kinetic energy is always conserved.

   

• B. Potential energy is always conserved.

   

• C. Mechanical energy is always conserved.

   

• D. Total energy is always not conserved.

The mechanical energy of a system of objects is...

 

• A. the sum of kinetic energy and gravitational potential energy.

   

• B. the sum of kinetic energy and elastic potential energy.

   

• C. the sum of kinetic energy and all relevant forms of potential energy.

   

• D. the sum of all forms of energy.

3. Mechanical energy is NOT conserved when...

•  A. gravitational potential energy is converted to kinetic energy.

   

• B. kinetic energy is converted ONLY to gravitational potential energy.

   

• C. kinetic energy is converted to JUST elastic potential energy.

   

• D. friction is not negligible.

Tags

NGSS.MS-PS3-5

Which event illustrates the direct transformation of potential to kinetic energy?

• A. A basketball player throw a flying ball.

•  B. A kalesa moves from rest.

•  C. Kathy’s arrow is released from its bow.

   

• D. The spring mechanism of a toy is rotated until it locked.

Tags

NGSS.MS-PS3-2

5. If mechanical energy is conserved in a system, the energy at any point in time can be in the form of...

•  A. kinetic energy.

   

• B. gravitational potential energy

   

• C. elastic potential energy

   

• D. all of the above