Energy Transformations

What is/are the energy transformation(s) that take place when using a wind turbine to generate usable energy?

• friction - electrical

• kinetic - mechanical - electrical

• friction - mechanical - electrical

• mechanical - friction - electrical

Tags

NGSS.MS-PS3-5

Wind turbines can generate a great deal of usable energy and have become popular because there is no cost to use wind and they do not emit greenhouse gases. A typical wind turbine is only 30% efficient, though. Explain what has happened to the other 70% of the energy.

• It is lost due to friction.

• It is converted to thermal energy.

• It is stored as potential energy in the turbine.

• It is released as mechanical energy into the air.

We have to eat in order to carry out all of our bodily processes. What type of energy transformation is taking place when we use that digested food in order to run?

• thermal to chemical

• chemical to mechanical

• mechanical to chemical

• electrical to chemical

Tags

NGSS.MS-LS1-7

A battery uses ________________ energy to generate ________________ energy.

• chemical, electrical

• thermal, mechanical

• nuclear, thermal

• solar, kinetic

Tags

NGSS.MS-PS3-5

Which example shows electrical energy being transformed into heat energy?

• burning a wax candle

• a small toaster oven toasts a bagel

• rubbing two sticks together

• sunlight heating a metal door

As the band passed by, the beating drums and trumpets made Billy feel like his body was beating with the music. He could hear the music and he could feel it! How would a scientist explain this to Billy?

• Sound waves cannot travel through the air

• Sound waves transmit energy through all forms of matter.

• The marching causes the ground to move which Billy feels

• Sound waves are transmitted faster through gases than through solids.

Tags

NGSS.MS-PS4-2

If a track star runs down the runway in the high jump event faster, he will be able to jump to a greater height. This is explained by the conservation of energy. Which statement best explains this idea?

• A faster runner creates more energy during their jump.

• A faster runner can apply a greater force than a slower runner.

• The upward push on the jumper is equal to his downward push on the ground.

• The kinetic energy before the jump is converted to potential during the jump.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which would be the best example to demonstrate the principle of conservation of energy?

• a stone is crushed

• light bends around a sharp edge

• a pendulum swings back and forth

• a balloon inflates when air is blown into it

Tags

NGSS.MS-PS3-5

According to the graph, which of these remains constant throughout?

• total amount of energy

• potential energy

• kinetic energy

• time

Tags

NGSS.MS-PS3-1

Which statement best summarizes the law of conservation of energy?

• When work is done, energy is lost.

• Heat flows from a warm body to a cold body.

• 
  If energy disappears in one form, it must reappear in another.

• The fewer the number of valence electrons, the better the insulator.

• Once energy is lost from a system, it can never be recovered.

Tags

NGSS.MS-PS3-5