PS.5a Review: KE and PE

Front

What is Kinetic Energy (KE)?

Back

Kinetic Energy 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 Potential Energy (PE)?

Back

Potential Energy is the energy stored in an object due to its position or state, commonly calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

What is Total Mechanical Energy?

Back

Total Mechanical Energy is the sum of Kinetic Energy and Potential Energy in a system, expressed as E_total = KE + PE.

Front

How does energy conservation apply to mechanical energy?

Back

In a closed system with no external forces, the total mechanical energy remains constant; energy can transform between KE and PE but the total remains the same.

Front

What happens to Kinetic Energy when an object comes to a stop?

Back

The Kinetic Energy is converted into other forms of energy, typically thermal energy due to friction.

Front

What is the relationship between height and Potential Energy?

Back

Potential Energy increases with height; the higher an object is, the more potential energy it has due to its position in a gravitational field.

Front

If a skater is at the bottom of a track with no friction, what is their Kinetic Energy?

Back

100% of the skater's total energy is Kinetic Energy at the bottom of the track.

Front

How do you calculate the Total Mechanical Energy of an object?

Back

Total Mechanical Energy is calculated by adding the Kinetic Energy and Potential Energy: E_total = KE + PE.

Front

What happens to the Total Mechanical Energy of a system with friction?

Back

Total Mechanical Energy decreases due to energy being transformed into thermal energy, which is not accounted for in mechanical energy calculations.

Front

What is the formula for calculating Kinetic Energy?

Back

KE = 1/2 mv², where m is mass and v is velocity.