1a
What is mechanical energy?
kenietic energy
What is thermal energy?
energy within a system that's created by the random motion of molecules and atoms
What is specific heat?
how much it takes to gain one degree of heat
What is the definition of impulse?
the change of momentum of an object when the object is acted upon by a force for an interval of time
Define gravitational potential energy.
The potimical energy of smthn falling to the ground
Describe radiation in simple terms.
energy that moves from one place to another in a form that can be described as waves or particles
Name a material with a high specific heat value.
stainless steel
State the formula for calculating momentum.
p=m x v
What happens to the gravitational potential energy of an object as it rises in height?
it will gain more velocity
How do convection currents form in boiling water?
The colder, denser water sinks below the lighter warmer water and moves toward the equator. As it becomes warmer and less dense, it begins to rise again
What is one application of low specific heat materials?
water
Calculate the impulse experienced by a car that comes to a stop from a speed of 20 m/s if its mass is 1,000 kg.
J= 1000 x (-20)=-20,000 kg x m/s
How does the mass of an object affect its kinetic energy?
its ability to move
Describe a real-world scenario where radiation is the primary method of heat transfer.
the sun
Compare the specific heat of water and metals. Why do they differ?
water takes a lot to boil while some metals don't take a lot of heat to get hot
Explain how changes in momentum can be observed in a car crash.
Even a relatively small increase in speed dramatically increases the momentum that must be absorbed during a crash.
Give an example of an object that stores elastic potential energy and explain why.
spring because it coils up and loads all the PE into the bottom and makes it shoot up
Evaluate the effectiveness of each method of thermal energy transfer in heating a room.
conduction, convection, and radiation
Describe how low specific heat improves performance in cooking utensils.
it gets hot faster so you can actually cook.
Compare the effects of impulse on two different sports: football and soccer. How does the type of collision affect the players' momentum?
the more mass and velocity the foot has, the more momentum the ball will have after the collision