Energy Transformations & Heat Transfer

The Law of Conservation of Energy states that

• energy is always created and destroyed.

• energy is neither created or destroyed, it just moves and transforms.

• energy is always created; but never destroyed or transformed.

Which action below is converting electrical to thermal energy?

• An electric vacuum cleaner

• An electric toothbrush

• An electric toaster

What affects the gravitational potential energy of an object?

• mass and volume

• length and width

• height and mass

• height and weight

Energy of motion is

• potential energy

• kinetic energy

• elastic energy

• chemical energy

When a ball bounces, when does kinetic energy convert into potential energy?

• When the ball moves downward

• When the ball moves upward

• When the ball is in constant motion

• When the ball is still

When a ball bounces, when does potential energy convert into kinetic energy?

• When the ball moves downward

• When the ball moves upward

• When the ball is in constant motion

• When the ball is still

When the temperatures of materials that are in contact are the same, the materials are said to be in

• thermal balance

• equality

• a powerful situation

• thermal equilibrium

____________________ occurs when snowflakes melt in your warm hands.

• convection

• conduction

• radiation

• thermal balance

When snowflakes melt in your hand, thermal energy (or heat) moves from _____________________ to ___________________

• your hand to the air

• your warm hand to the snowflake

• the snowflake to the air

• from the warm air to the snowflake

Heat transfer is really neat; it always goes from ________ to _________

• cold to hot

• cold to warm

• lukewarm to warmer

• hot to cold