Mechanical Energy Transformations

Front

Amy lit a firework rocket that moved skyward and produced a burst giving off light and a loud sound. Which statement is true about the energy transformation the firework underwent?

Back

The potential energy of the firework was transformed into kinetic energy when moving skyward.

Front

In which position does the baseball possess potential energy?

Back

When the ball is held close to the pitcher’s chest.

Front

At which point is the potential gravitational energy of a basketball at its greatest?

Back

when the basketball nears the top of its arc

Front

What does the Law of Conservation of Energy state?

Back

Energy cannot be created or destroyed.

Front

The image shows three positions (W, X, and Y) of a pendulum during its motion.

If the pendulum swings consistently according to the Law of Conservation of Energy, which statement is true?

• Potential energy will be maximum at positions W and Y and minimum at X.
• Kinetic energy will be maximum at positions W and Y and minimum at X.
• Potential energy will be maximum at positions W and X and minimum at Y.
• Kinetic energy will be maximum at positions W and X and minimum at Y.

Back

Potential energy will be maximum at positions W and Y and minimum at X.

Front

Which slingshot would cause the paper ball to travel the greatest distance?

Back

Front

The diagram shows the various energies possessed by a ball falling from a height of 20 m.

Which statement is an accurate conclusion made from the data?

• The total energy of the ball decreases during its fall.
• The total energy of the ball is equal to potential energy.
• The total energy of the ball remains constant during its fall.
• The total energy of the ball is converted into kinetic energy during its fall.

Back

The total energy of the ball remains constant during its fall.

Front

A student makes a diagram of a cart at three different positions on a hill to demonstrate the transformation of kinetic energy to potential energy as the cart moves through the positions.

Assuming no energy is lost to friction, which graph demonstrates the correct energy transformations at the three positions?

Back

Front

A student makes a model of a roller coaster using a plastic track and a marble. Four positions (1, 2, 3, and 4) are labeled on the track. Assuming that the marble loses no energy due to friction, and all energy is conserved, which statement is correct? Options: The amount of potential energy possessed by the marble is the same at all positions. The sum of the potential and kinetic energy decreases as the marble moves from position 1 to 2. The kinetic and potential energy of the marble are equal at all positions. The amount of kinetic energy lost is equal to the amount of potential energy gained as the marble moves from position 3 to 4.

Back

The amount of kinetic energy lost is equal to the amount of potential energy gained as the marble moves from position 3 to 4.

Front

Distinguish the statements as inferences or observations: inference: 3; observation: 1, 2, and 4; inference: 1; observation: 2, 3, and 4; observation: 1; inference: 2, 3, and 4; observation: 3; inference: 1, 2, and 4.

Back

inference: 1; observation: 2, 3, and 4