Energy Bar Charts Flashcard

Front

What is Total Mechanical Energy (TME)?

Back

Total Mechanical Energy (TME) is the sum of potential energy (PE) and kinetic energy (KE) in a system. It remains constant in a closed system without external forces.

Front

What is Kinetic Energy (KE)?

Back

Kinetic Energy (KE) is the energy an object possesses due to its motion, calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

What is Mechanical Energy (ME)?

Back

Mechanical Energy (ME) is the sum of potential energy and kinetic energy in a system. It represents the total energy available for doing work.

Front

How does lifting an object at constant velocity affect its mechanical energy?

Back

When lifting an object at constant velocity, the mechanical energy of the weight-earth system increases due to the increase in gravitational potential energy.

Front

What happens to mechanical energy in a closed system?

Back

In a closed system, mechanical energy remains constant, as energy is conserved unless acted upon by external forces.

Front

What is the relationship between potential energy and height?

Back

Potential energy increases with height, as it is calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

What does a bar chart representing energy indicate?

Back

A bar chart representing energy shows the distribution of kinetic and potential energy at different positions in a system, helping visualize energy transformations.

Front

What is the significance of constant speed in energy bar charts?

Back

Constant speed indicates that kinetic energy remains constant while potential energy may change, reflecting energy conservation in motion.

Front

How do you calculate Total Mechanical Energy at a position?

Back

Total Mechanical Energy at a position is calculated by adding the kinetic energy and potential energy at that position: TME = KE + PE.

Front

What does it mean if mechanical energy decreases?

Back

If mechanical energy decreases, it indicates that energy is being transformed into other forms, such as thermal energy, often due to friction or air resistance.