Topic 2 and 3

• The gravitational field is a special field, if it is stationary, that is, not time-dependent, it is conservative. This means that a body moving inside the field along a closed path will, at the end of the journey, not have lost or gained energy.
• Conservative Forces is a force that offers a two-way conversion between kinetic and potential energies (gravitational force, elastic force) and it doesn’t depend on the path, only on the initial and final position.
• Non-Conservative Forces are dissipative force (causes mechanical energy to be lost) and it is a frictional force.
• Since the gravitational field is attractive and the zero is at infinity, the gravitational potential is negative.
• The value which is the amount of energy gained or lost by a unit or test mass when traveling from an agreed-upon starting point to another point called Potential.
• The gravitational potential therefore increases steadily as the distance above the ground increases.
• Gravity is opposite in gravity potential.
• Centrifugal force is an apparent outward force on an object that is moving in a circle.
• Gravity is the resultant (or the combined effect) of gravitational force and the centrifugal force caused by the earth’s rotation.
• Gravity (force of gravity) is responsible for holding objects onto the surface of planets and is responsible for keeping objects in orbit around one another.