Free Fall
What is the only force acting on an object in free fall?
What is the difference between an open and closed system?
Open system can exchange matter and energy
Closed system can only exchange energy
What would a graph with no acceleration look like?
Straight line
What is Newton's third law of energy?
for every action (force), there is an equal and opposite reaction.
What is entropy?
disorder/randomness in the universe.
If the time it takes a softball to fall to the ground is 8 seconds, what is the velocity of the softball?
V = gt
V = (9.8) x (5) = 49 m/s
Give an example for an open, closed, and isolated system.
coffee mug, thermos, styrofoam cup
What would an increasing acceleration graph look like and what is an example of this?
Exponential graph,
car accelerating, plane accelerating, etc.
If in a game of tug of war, one side is producing a force of 500N and the two sides are in equilibrium, what is the force the other side is producing?
-500N
If I push a table with a 4N force about 0.2m, how much work am I doing?
W = fx
W = (4)(0.2) = 0.8 J
If a basketball is falling at 4 m/s and 3 seconds later it has a faster velocity, what is that velocity?
V = V0t + gt^2
V = (4)(3) + (9.8)(3)^2 = 100.2 m/s
An open system has boundaries which are _____ closed
NOT
If I throw a ball, what two motion graphs will I get?
Projectile horizontal distance and time
Projectile vertical distance and time
If there is no net external force and the system is in equilibrium, which law is the system obeying?
Newton's first law of motion
Enthalpy is how _________ changes.
energy
If Jupiter’s gravity is 25 m/s^2, then what would be the velocity of a NASA probe on Jupiter hitting the ground after 7 seconds from being let go?
V = gt
V = (25)(7) = 175 m/s
In a closed system, the mass of the system is ___________.
constant
Give an example of an oscillating graph and draw it.
drunk driver, boat tossing up and down a river, etc.
When forces are balanced there is no change in _____________________.
motion/direction
The Conservation of energy is which thermodynamic law?
First law of thermodynamics
If a skydiver is on a plane then their initial velocity is 0m/s, however, how far did they fall if it took the skydiver 50 seconds to reach the ground once they jumped?
d = (0)(50) + 1/2 (9.8)(50)^2
d = 12,250 m
In a lab setting, why would it be useful to know the difference between open, closed, and isolated systems?
To know how to properly store chemicals, to know if you can heat up or cool down chemicals in certain materials, etc.
A windmill turning would be an example of what kind of graph?
Uniform Circular
What is one thing we've defined this block that will ALWAYS result in a balanced force?
pressure
What is the second and third law of thermodynamics?
The entropy of the universe increases.
The entropy of a system at absolute zero is typically zero