Conservation of Energy

A bowling ball is hanging on a rope, 3.0 m above the floor. A teacher pulls the bowling ball towards his chest to a height of 6.5 m and lets go. The ball swings away from the teacher and swings back. If kinetic and potential energy are conserved, what is the height of the bowling ball when it swings back to the teacher's chest?

• 6.5 m.

• 3.5 m.

• 1.5 m.

• 2.5 m.

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NGSS.MS-PS3-2

NGSS.MS-PS3-5

An engineer is working to design a bouncy ball that conserves all of its kinetic and potential energy. She drops the ball to the ground from a height of 8 meters. If it really works, how high should the ball bounce?

• Between 1 and 2 meters.

• Between 4 and 5 meters.

• Exactly 0 meters.

• Exactly 8 meters.

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NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

A teacher lifts a laptop off a table. The laptop gains potential energy. Where does this energy come from?

• The energy comes from the laptop itself.

• The energy comes from the teacher.

• The energy comes from Earth.

• The energy came from the air.

Tags

NGSS.MS-PS3-2

What does the term conservation mean in regard to energy?

• Energy is not created or destroyed; the same amount is always present in some form.

• Energy can be created, but it cannot be destroyed.

• Energy is a fixed amount, and once it is used it is lost forever.

• Energy is unstable and constantly changes from one form to another.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Isabel pushes a toy truck, giving it kinetic energy. When this happens, what happens to the energy in her arm?

• The energy in her arm increases.

• The energy in her arm stays the same.

• The energy in her arm decreases.

• The energy in her arm is destroyed.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Erick kicks a soccer ball across a level field, and it rolls to a stop. Which of the following is an energy change in the ball?

• Potential energy is converted to heat.

• Kinetic energy is converted to heat.

• Potential energy is converted to kinetic energy.

• Kinetic energy is converted to potential energy.

Tags

NGSS.MS-PS3-5

A student is holding a stone at a certain height. The stone has 80 joules of potential energy and 0 joules of kinetic energy. The stone is released from that height. How much energy does the stone have right before it hits the ground?

• The stone will have about 40 joules each of kinetic and potential energy.

• The stone will have about 0 joules of kinetic energy and 50 joules of potential energy.

• The stone will have about 80 joules of kinetic energy and 80 joules of potential energy.

• The stone will have about 80 joules of kinetic energy and 0 joules of potential energy.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

What happens to the total energy in a closed system?

¿Qué sucede con la energía total en un sistema cerrado?

• The energy grows and increases over time.

• The energy is unstable and changes unpredictably.

• The energy is conserved and does not change.

• The energy is destroyed and disappears over time.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which statement is true according to the law of conservation of energy?

¿Qué enunciado es verdadero según la ley de conservación de la energía?

• Energy can be destroyed.

• Energy can be created.

• Energy can change to matter.

• Energy can change forms.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

What unit is used to measure transferred heat energy between a substance and its environment?

¿Qué unidad se usa para medir la energía térmica transferida entre una sustancia y su entorno?

• Degrees Celsius.

• Joules or calories.

• Grams.

• Milliliters.

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NGSS.MS-PS3-4