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The picture shows the process that causes a glow stick to emit light. Based on the picture, which of the following describes the energies involved?

• Kinetic energy cracks the stick, allowing gravitational energy to transform into light

• Mechanical energy cracks the stick, allowing chemical energy to transform into light

• Chemical energy cracks the stick, allowing thermal energy to transform into light

• Thermal energy cracks the stick, allowing potential energy to transform into light

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NGSS.MS-PS1-2

Kyle is riding his bicycle. He works very hard to reach the top of a hill and then coasts down the other side. Which statement best explains why Kyle does not need to work as hard as he travels downhill?

• Kinetic energy is stored in the bicycle

• There is less friction between the road and the bike as it moves downhill

• No energy is lost as heat as Kyle rides downhill

• Potential energy is converted to kinetic energy as he moves downhill

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According to the Law of Conservation of Energy, which statement regarding this track is TRUE?

• The cart at position 3 will have more kinetic energy than at position 1

• The cart will be travelling slower at position 4 than at position 2

• The cart will have more potential energy at position 2 than at position 4

• The kinetic energy of the track is equal at all points

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If a pot of water is placed over a fire, which of the following transfer of thermal energy would take place?

• convection

• reflection

• transcription

• placement

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A flashlight uses three different forms of energy. Which of the following is the correct order of the energy transformation to power the flashlight?

• Mechanical — Thermal — Light/Heat

• Electrical — Chemical - Light/Heat

• Chemical — Electrical —Light/Heat

• Light/Heat — Electrical — Chemical

Which option describes an example of converting light energy to electrical energy?

• plugging in a desk lamp

• switching on a stove burner

• turning on a solar–powered calculator

• turning on a battery–powered flashlight

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NGSS.MS-PS4-2

A man plugs in an iron to press a shirt. Within a couple of minutes the metal part of the iron is very hot. What type of energy transformation is taking place?

• chemical energy to light energy

• light energy to electrical energy

• thermal energy to chemical energy

• electrical energy to thermal energy

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Which piece of evidence best supports the idea that energy cannot be created nor destroyed, only changed from one form to another?

• A spider can spin a web to trap different insects.

• A plant must absorb water through its roots to grow.

• A person can grow vegetables to eat in his own backyard.

• An animal must eat food to be able to run and move around.

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__________ is the energy carried from one object to another because of temperature.

• Vibration

• Heat

• Weather

• Water

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Heat flow is the transfer of energy from __________.

• a cooler object to a warmer object

• a solid object to a fluid object

• a warmer object to a cooler object

• a fluid object to a solid object

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