Vriend Thermal Energy 2 Flashcards
If kinetic energy increases then the molecules in an object will
The molecules will increase their motion making the object warmer. Rubbing your hands together faster and faster.
What would happen to the molecules if the kinetic energy in an object was decreased?
The motion of the molecules would slow down. or decrease.
In the game of croquet, a ball that comes to rest next to an opponent’s ball is held down by the player’s foot and the player hits their own ball sending the other player’s ball moving away. Explain how this is possible.
When the ball collides with the stationary ball it is the kinetic energy,which is transferred between the two balls and causes the opponent’s ball to move. The same transfer of energy occurs when balls make contact in a game of pool.
Whenever we talk about thermal energy we always talk about where the _______ is going.
Heat because heat is the energy that will always move to be cooler.
When considering the thermal energy contained in the particles that make up an object, the object with more particles will have more or less thermal energy?
The larger object…will have more thermal energy… because it has more particles that can move and create heat.
What happens to energy in a closed system..
Since the system is closed, nothing can be added or taken away. The energy within can only change its form.
Some metals are better _______________ of heat than other metals. Copper kettles heat better than steel kettles.
Conductors - two objects touching and transfering thermal energy.
Insulators are used to
Keep heat from being lost from an object
(coat on a cold windy day keeps the heat in your body)
or
Keep the heat away from an object
(a pot holder protecting a hand from being burnt by a hot frying pan handle.
In the Terrarium in the classroom, the plants are producing energy and giving off heat energy, oxygen and water. The heat warms the air in the terrarium. The water evaporates from the leaves and floats up. The hot moist air creates steam at the top. Explain why there is steam at the top of the terrarium that eventually condensates and drops back down.
When the warm moist air rises, the air near the top of the terrarium is cooler because the top has more contact with the atmosphere outside the terrarium. When the moist air particles start to cool down they slow down and begin sticking together at the top of the terrarium creating a fog-like coating at the top.
Describe each form of thermal energy transfer:
Radiation
Convection
Conduction
Radiation - heat transfer through space
(tanning by the pool)
Convection - heat tranfer using a liquid or gas
(noodles boiling in water)
Conduction - heat tranfer between 2 objects that are touching each other.
(ice in your hand)
