Gravity Force Quiz

Study Notes

Gravity is a fundamental force of nature that causes objects with mass to attract each other
The force of gravity is always attractive, never repulsive
Gravity is a weak force compared to other fundamental forces like electromagnetism and strong and weak nuclear forces
Gravity is responsible for:
- Holding planets in orbit around their stars
- Holding moons in orbit around their planets
- Holding humans and objects on the surface of the Earth
- Forming galaxies and galaxy clusters

Universal gravitation is the gravitational attraction between any two objects with mass in the universe
The law of universal gravitation, also known as the law of gravity, was first described by Sir Isaac Newton
The law states that every point mass attracts every other point mass by a force acting along the line intersecting both points
The force of gravity depends on:
- The mass of the objects
- The distance between the objects
Formula: F = G * (m1 * m2) / r^2, where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between the objects

An object in orbit is one that is moving around a larger object, such as a planet or moon, under the influence of gravity
Orbits can be:
- Closed orbits: elliptical or circular orbits that remain stable over time
- Open orbits: hyperbolic orbits that allow an object to escape the gravitational pull of the larger object
Escape velocity is the minimum speed an object needs to escape the gravitational pull of a larger object
Formula: v = √(2 * G * M / r), where v is the escape velocity, G is the gravitational constant, M is the mass of the larger object, and r is the radius of the larger object
Examples:
- Escape velocity from the Earth's surface: approximately 11.2 km/s
- Escape velocity from the Sun's surface: approximately 618 km/s

Gravity is a fundamental force that attracts objects with mass to each other
Gravity is always attractive, never repulsive
Gravity is a weak force compared to electromagnetism, strong and weak nuclear forces
Gravity is responsible for:
- Holding planets in orbit around their stars
- Holding moons in orbit around their planets
- Holding humans and objects on the surface of the Earth
- Forming galaxies and galaxy clusters

Universal gravitation is the gravitational attraction between any two objects with mass in the universe
The law of universal gravitation was first described by Sir Isaac Newton
The law states that every point mass attracts every other point mass by a force acting along the line intersecting both points
The force of gravity depends on:
- Mass of the objects
- Distance between the objects
Gravity formula: F = G * (m1 * m2) / r^2, where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between the objects

An object in orbit is one that is moving around a larger object, such as a planet or moon, under the influence of gravity
Orbits can be:
- Closed orbits: elliptical or circular orbits that remain stable over time
- Open orbits: hyperbolic orbits that allow an object to escape the gravitational pull of the larger object
Escape velocity is the minimum speed an object needs to escape the gravitational pull of a larger object
Escape velocity formula: v = √(2 * G * M / r), where v is the escape velocity, G is the gravitational constant, M is the mass of the larger object, and r is the radius of the larger object
Examples:
- Escape velocity from the Earth's surface: approximately 11.2 km/s
- Escape velocity from the Sun's surface: approximately 618 km/s