Energy

A hand-held video game is powered by batteries. After playing the game for several minutes, a student notices the game feels warm.Which of the following is the MOST LIKELY explanation for this observation?

• The game creates energy when it is turned on.
• Some of the energy from the batteries is changed to heat.
• Some of the energy from the batteries is changed to friction.
• The game receives heat energy from the person playing it.

Your hands get warm by a fire because _______________ energy is converted into heat energy.

• chemical
• electrical
• mechanical
• nuclear

Within the alarm clock seen here, energy is transformed. It is time to get up! The alarm clock goes off. What are the energy transformations taking place in your alarm clock?

• electrical to magnetic to sound
• electrical to mechanical to sound
• electrical to mechanical to light
• chemical to electrical to mechanical

Maddie and Juan's were given the  task of trying to cook a hot dog using the Sun! They built this oven using a box and aluminum foil. After setting up the device, they put two hot dogs in the box. Ten minutes later the hot dogs were hot and ready to eat. Describe the energy transformation that took place in the students' oven.

• Solar energy to heat energy
• Solar energy to light energy
• Reflected energy to heat energy
• Light energy to mechanical energy

As temperature of a substance rises from 20°C to 50°C, the substance _______ heat and its kinetic energy _________.

• remains constant; increases
• absorbs; remains constant
• releases; increases
• absorbs; increases

Light wands are small tubes that can be used to give off light without electricity or fire.A light wand keeps two fluids separate from each other until the wand is bent. Once the wand is bent, the tube holding the inner fluid breaks, and the two fluids mix together inside the wand.
Where does the light energy of a glowing light wand come from?

• the heat energy of the fluids inside the wand
• light energy from the Sun striking the wand
• the mechanical energy of the broken tube
  
• the chemical energy of the fluids inside the wand

A circuit is shown in the picture above. Energy is transferred first from the battery to the circuit wire and then from the circuit wire to the light. What energy transformations occur between these two transfers?

• Energy is transformed first from chemical energy to mechanical energy and then from mechanical energy to light and heat energy.
• Energy is transformed first from chemical energy to light and heat energy and then from light and heat energy to electrical energy.
• Energy is transformed first from mechanical energy to chemical energy and then from chemical energy to light and heat energy.
• Energy is transformed first from chemical energy to electrical energy and then from electrical energy to light and heat energy.
  

Tags

NGSS.MS-PS3-5

Which of the following is the main reason water at the surface of the ocean is warmer than water at the bottom of the ocean?

• Water at the bottom of the ocean contains more dissolved solids
• Water at the surface of the ocean absorbs more energy from the sun
• Friction is created by fast moving currents at the surface of the ocean
• Wave action transfers heat from the bottom of the ocean to the surface

Tags

NGSS.MS-ESS2-4

Which of the figures here correctly shows the conduction of heat within the system of metal blocks? (bottom left block is 5^oC, top block is -20^oC, and bottom right block is 100^oC)

• A
• B
• C
• D

The diagram above shows 3 different methods of heat transfer. Identify which letter in the diagram represents radiation, convection, and conduction.

• A- conduction
  B- convection
   C- radiation
• A- radiation
  B- conduction
  C- convection
• A- convection
  B- conduction
  C- radiation
• A- convection
  B- radiation
  C- conduction