Gravity
Orbit Shapes
Energy in Orbits
Facts about Phin
100
Gravity can be defined as the force of attraction between ________.
All objects with mass
100
A planet in a circular orbit travels at a constant speed throughout the entirety of its orbit.
True or False?
True
100
The kinetic energy formula is KE = 0.5mv2
The potential energy formula is PE = mgh
What do the letters m, v, g, and h stand for?
m = mass
v = velocity
g = gravity / gravitational force
h = distance / height
100
What year did Phin last have a clean-shaven face?
A. 2018
B. 2021
C. 2024
B. 2021
200
What two factors determine the strength of gravitational force between two objects?
Mass and distance
200
Rank these three orbits in order of eccentricity, from highest to lowest.
C, B, A
200
At which point on the orbital pathway will the satellite be moving the fastest? At which point will it be moving the slowest?
Fastest at point A, slowest at point C
200
Phin co-teaches Advisory with what teacher?
Mr. Morales
300
A space station orbiting earth has a mass of 3.2x105. Earth has a mass of 5.97x1024. The space station orbits Earth at a distance of 6.0x104.
Use the Universal Law of Gravitation to calculate the force of gravity between Earth and the Space Station.
Hint: G = 6.67x10-17
127.42x1012 / 36.0 x 108
35,394.44 N of force300
An asteroid with a period of 4.5 years and a semimajor axis of 3 AU collides with another asteroid in the asteroid belt. After the collision, the asteroid now has a semimajor axis of 2.8 AU. What would we expect to be to happen to the period of the asteroid after the collision?
A. Increase
B. Decrease
C. Stay the same
B. Decrease
300
Why does a meteor lose kinetic energy as it gets further from the sun?
The sun's gravity pulls the meteor backward, slowing it down and causing the kinetic energy to decrease.
300
What other class does Phin teach besides Physics?
Algebra 1
400
Gravity constantly pulls an orbiting satellite toward Earth. Why doesn’t the satellite fall straight down to the surface?
The satellite is moving with a velocity that is pointed away from Earth.
400
The semimajor axis is the measurement of distance between what two points?
The center of the orbit and the farthest point of the orbit path from the center.
400
What is the kinetic energy of an orbiting meteor with a mass of 8,000,000 kg and a velocity of 10,500 m/s?
KE = 0.5(8,000,000)(10,5002)
KE = 4.41x1014 J of energy
400
Which country does Phin NOT have a strong interest in traveling to?
A. South Africa
B. Scotland
C. The Bahamas
D. China
C. The Bahamas
500
Imagine a satellite orbiting Earth. If the velocity suddenly became faster but the gravitational force stayed the same, how would the orbit change?
The orbit would become larger because there would be more energy pulling the satellite away from Earth. If the velocity was fast enough, the satellite might leave the Earth's orbit completely.
500
Explain how the orbit path of Chelyabinsk meteor could have been changed without the meteor being physically touched?
Gravity from other objects like Jupiter slightly pulling on the meteor over time
500
It takes a meteor the same time to travel from P1 to P2 as it does to travel from P3 to P4, even though the distance between P1 and P2 is longer. How can this be, and why?
The meteor is moving faster between P1 and P2 because the pull of gravity is stronger there. It is stronger because it is closer to the sun.
500
What year will Phin retire?
2066