5.2 Energy transformation

A pendulum bob swings back and forth in an arc. Which describes the energy conversion process as the pendulum moves from left to right? SC.6.P.11.1

• kinetic energy to chemical energy to potential energy

• kinetic energy to potential energy back to kinetic energy

• potential energy to kinetic energy back to potential energy

• potential energy to kinetic energy to electromagnetic energy

According to the law of conservation of energy, what happens to the total amount of energy in the universe? SC.6.P.11.1

• A It remains constant.

• It changes constantly

• It increases

• It decreases.

A girl drops the ball she is holding. Which best explains the energy transformation taking place in the system? SC.6.P.11.1

• The ball in her hands has kinetic energy. When it falls, the kinetic energy changes to potential energy

• The ball in her hands has potential energy. When it falls, the potential energy changes to kinetic energy.

• The ball in her hands has potential energy. When it falls, the potential energy remains constant.

• The ball in her hands has kinetic energy. When it falls, the kinetic energy remains constant.

Which statement about energy transformations is not true? SC.6.P.11.1

• A All forms of energy can be transformed into thermal energy.

• Energy is never destroyed or created during transformations.

• Potential chemical energy always transforms into kinetic energy.

• Some thermal energy is always released during a transformation.

When a ball is thrown upward, where does it have the least kinetic energy? SC.6.P.11.1

• at its lowest point when it is moving downward

• at its lowest point when it is moving upward

• midway between its highest point and its lowest point

• at its highest point

A rock falls from a ledge to the ground. What energy conversion occurs during this process? SC.6.P.11.1

• Potential energy is converted into kinetic energy

• Kinetic energy is converted into potential energy

• Thermal energy is converted into mechanical energy.

• Chemical energy is converted into mechanical energy