science lt 3

• Gravitational potential energy is directly proportional to a height of the object
• If we double the masses of two objects gravitational force quadruple.
• If we double the distance of two object gravitational force quadruples.
• The Universal Gravitational Constant G was discovered by Henry Cavendish.
• Newton is the unit of force.
• Acceleration is directly proportional to the net force.
• Law of interaction states that for every action there is equal and opposite reaction.
• Acceleration is inversely proportional to the mass of the object.
• Inertia deperds on the mass of the object alone
• Acceleration is a vector quantity.
• Acceleration measures the rate of change of velocity over time.
• speed is distance of time (d/t)
• velocity is displacement over time (d/t)
• Law of period states states that the farther a planet's average distance from the sun, the longer the orbital its period
• Johannes Kepler developed the three laws of planetary motion.
• Cosmica Sidera is also known as Galilean Moons
• Galileo discovered the moons of jupiter
• Aristotle proposed the prime mover which drives the motion of the planets.
• Sidereal year - the time it takes for the sun to return to the same point relative to the fixed stars
• Retrograde motion is the apparent backward movement of the planets
• Diurnal motion is earth's motion that refers to the daily rising and setting of the sun
• alteration motion refers to a type of motion that describes qualitative change
• Violent motion happens when an object is acted upon by any external force
• Physics is a branch of science that deals with the relationship of matter and energy.
• celestial motion is movement of any object beyond Earth.
• natural motion is determined by the nature of an object's composition.
• Horizon is the line that separates the visible portion of the celestial sphere from the part that we cannot see.
• ecliptic is the sun's apparent path in the celestial sphere.
• There are two equinoxes in a year vernal and autumnal wherein the day and night are equal in length.
• polaris - The star that can only be seen in Northern Hemisphere and always situated in the North pole
• solstice - It happens when the sun's position reaches its northernmost or southernmost relative to the celestial equator
• diurnal motion - Type of earth's motion that refers to the daily rising and setting of the sun.
• annual motion - It refers to the apparent shift in location of the stars attributed to the revolution of Earth around the sun.
• sidereal year - the time it takes for the sun to return to the same point relative to the fixed stars
• tropical year - the time it takes for the sun to return to an equinox.
• it takes 26000 years for Earth to complete one full precession.
• lunisolar - caused by gravitational attraction of the sun and moon.
•  planetary - Type of precession of the ecliptic caused by other planets
• 1. The total mechanical energy is the sum of potential and kinetic energy.
• kinetic energy - energy in motion