F4C3: Gravitation Flashcards
1
Q
centripetal force
A
a force acts on the body in a direction towards the centre of the circle
2
Q
Kepler’s First Law (Law of Orbit)
A
all planets move in elliptical orbits with the Sun at one focus
3
Q
Kepler’s Second Law (Law of Area)
A
a line that connects a planet to the Sun sweeps out equal areas in equal times
4
Q
Kepler’s Third Law (Law of Periods)
A
the square of the orbital period of any planet is directly proportional to the cube of the radius of its orbit
5
Q
escape velocity
A
minimum velocity required by an object on the surface of Earth to overcome the gravitational field and reach infinity
