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Black holes regions in space formed due to the
collapse of a massive star at the end of its life.
? In 20th century scientists discovered regions in space with immense
gravity, so even light can’t escape from them.
Orbital motion the rotation of any object in space
around another central body in a curved path due to the
gravitational attraction.
? Motion of moon around the earth.
? Motion of earth around the sun.
? Motion of Satellites around the earth.
Field forces in helium atom:
1- Electrostatic attraction:
+ve nucleus & each -ve electron.
2- Electrostatic repulsion:
2 -ve electrons
3- Electrostatic repulsion:
2 +ve protons
4- Gravitational: “The weakest”
Nucleus & each electron.
Electric forces Magnetic forces Gravitational forces
Electric charge affects Magnetic pole affects Object’s mass affects
another at a distance another at a distance. another at a distance.
Attractive / repulsive Attractive only
Represented by
Represented by Represented by gravitational field lines
electric field lines magnetic field lines
First Term 140
