Energy Post-Test

Which graph best represents the relationship between the ball's gravitational energy and its height above the ground?

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Which object would have the most kinetic energy?

• A zebra running at 10 km/h

• A mouse running at 11 km/h

• An elephant sitting at the top of a cliff

• A sloth hanging from a tall tree

Which two terms are most likely to be used to label the data in the first column?

• Speed (m/s)

• Mass (kg)

Which kind of energy does the toy have because of its shape?

• Electrical

• Elastic

• Nuclear

• Chemical

Which energy transformation will occur when this rubber band is let go?

• Chemical energy

• Mechanical energy

• Mechanical energy → electrical energy

• Elastic energy → chemical energy

Assume that a person bouncing a ball represents a closed system. Which statement best describes how the amounts of the ball's potential and kinetic energy change?

• The ball's kinetic energy increases as it falls and its potential energy decreases.

• Both the kinetic and potential energy of the ball decrease.

• The ball's potential energy decreases as it rises and its kinetic energy increases.

• Both the kinetic and potential energy of the ball increase.

The photo shows a roller coaster. Assume that the system is closed. Which roller-coaster car has the least potential energy due to gravity?

• Car A

• Car B

• Car C

• Car D

Which energy transformation is shown in the photo?

• Electromagnetic and thermal → chemical

• Electromagnetic and thermal- electrical

• Electrical → electromagnetic and thermal

• Chemical → electromagnetic and thermal

Which type of energy change causes this leaf to grow?

• Thermal energy is transferred to the leaf.

• Electromagnetic energy is transferred to the leaf.

• Thermal energy is transformed into potential energy.

• Electromagnetic energy is transformed into chemical energy.

Which two statements provide evidence of conservation of energy in this example?

• The black ball moved because the white ball transferred kinetic energy to it during the collision.

• The white ball stopped because all its kinetic energy was transferred to the black ball.

• The black ball moved because the white ball created more energy during the collision.

• The white ball stopped because energy naturally disappears over time.