All Things Heat
Impulse/Momentum
Characteristics of Heat
Law of Conservation of Momentum
Random
100
The transfer of thermal energy from a warmer to cooler object
What is heat?
100
If you have the Impulse and Force what can you find?
Time.
100
The transfer of heat through empty space by electromagnetic waves.
What is radiation?
100
Two dodge balls are rolling toward each other and bounce off, is momentum conserved?
Yes
100
The type of heat transfer that occurs when you burn your hand when you touch the metal end of a curling iron.
What is conduction?
200
The average heat or thermal energy of the particles in a substance.
What is Temperature?
200
If you decrease the velocity does the momentum increase or decrease?
Decreases.
200
The transfer of heat by direct contact between particles.
What is conduction?
200
When fighting fires, a firefighter must use great caution to hold a hose that emits large amounts of water at high speeds. Why would such a task be difficult?
The hose is pushing lots of water (large mass) forward at a high speed. This means the water has a large forward momentum. In turn, the hose must have an equally large backwards momentum, making it difficult for the firefighters to manage.
200
Is Momentum and Impulse a scalor or a vector?
Vector.
300
Heat always moves from _________ to __________.
warmer; cooler
300
If you increase the momentum does the mass or velocity increase?
Trick Question. It could be either.
300
T or F: The temperature of a substance depends on how much of the substance you have.
False.
300
Draw the picture on a whiteboard of the before and after of a collision of 2 pool balls colliding into each other.
300
If the change in momentum is 10Ns, then what is the Impulse?
10 Ns
400
Faster moving particles will have _______ kinetic energy and therefore a _______ temperature than slower moving particles.
more; higher
400
A .25kg marble is rolling on the floor at 2m/s, what is the momentum?
0.5 Ns or 0.5 kg*m/s.
400
In which phases of matter do the particles have kinetic energy?
All phases.
400
Draw on a white board the image of a bullet before it collides with a wooden block and after the collision.
400
What do you have when you divide the Impulse by the Time?
Force.
500
3 scales for measuring temperature.
What is Fahrenheit, Celsius, and Kelvin?
500
If you have force, time, and mass what can you find?
Change in velocity.
500
Explain how convection works.
Fluids close to the heat source warm up, the particles spread out, becoming less dense, fluid rises; cooler fluid is less dense so it sinks.
500
Define the Law of Conservation of Momentum.
The total momentum of all the objects in a system before a collision is equal to the total momentum all the objects in a system after the collision.
500
What are insulators used for?
To prevent or slow down the transfer of thermal energy.