Energy & Conservation of Mechanical Energy

Front

What is Mechanical Energy?

Back

Mechanical energy is the sum of potential energy and kinetic energy in a system. It is the energy associated with the motion and position of an object.

Front

Define Potential Energy.

Back

Potential energy is the energy stored in an object due to its position or configuration. It is often associated with gravitational energy, which depends on the height of the object above a reference point.

Front

Define Kinetic Energy.

Back

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

Front

At which point is potential energy greatest in a roller coaster?

Back

Potential energy is greatest at the highest point of the roller coaster, where the height is maximum.

Front

What happens to potential energy as an object falls?

Back

As an object falls, its potential energy decreases while its kinetic energy increases, assuming no energy is lost to friction.

Front

What is the principle of Conservation of Mechanical Energy?

Back

The principle of Conservation of Mechanical Energy states that in the absence of non-conservative forces (like friction), the total mechanical energy of a system remains constant.

Front

How does height affect potential energy?

Back

Potential energy increases with height. The higher an object is, the more gravitational potential energy it has, calculated by PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is the relationship between kinetic energy and speed?

Back

Kinetic energy is proportional to the square of the speed. If the speed of an object doubles, its kinetic energy increases by a factor of four.

Front

How do you calculate the height of a hill using energy conservation?

Back

To calculate the height of a hill using energy conservation, set the potential energy at the top equal to the sum of kinetic energy and potential energy at another point.

Front

What is the formula for calculating Kinetic Energy?

Back

The formula for calculating Kinetic Energy is KE = 1/2 mv², where m is the mass of the object and v is its velocity.