Conservation of Energy Part 3: Gravitational Potential Energy

The video tutorial explains gravitational potential energy, starting with a review of work as the integral of force. It uses a practical example of a ball moving under various forces to calculate the work done by gravity. The setup involves choosing an arbitrary axis and understanding the direction of gravitational force. The tutorial simplifies the integral for work done by gravity, assuming constant mass and gravity. It defines gravitational potential energy and relates it to work, setting the stage for further discussions on conservative forces.

What is the primary focus when calculating the work done by gravity in the given example?

• The work done by external forces

• The work done by friction

• The work done by gravity alone

• The total work done by all forces

In the chosen coordinate system, which direction is considered positive for the Y-axis?

• Towards the right

• Towards the left

• Away from the ground

• Towards the ground

What is the direction of the gravitational force in the coordinate system?

• Positive Y direction

• Negative Y direction

• Positive X direction

• Negative X direction

When simplifying the work done by gravity, which assumption is made about gravity?

• Gravity is negligible

• Gravity is constant

• Gravity varies significantly with height

• Gravity is zero

What is the formula for work done by gravity derived in the video?

• MG * Delta X

• -MG * Delta Y

• MG * Delta Z

• -MG * Delta X

How is gravitational potential energy defined in the video?

• MGX

• MGY or MGH

• MGZ

• MGH or MGX

What does a negative change in gravitational potential energy indicate?

• Energy is created

• Energy remains constant

• Energy is lost

• Energy is gained