The sum of all the dp/dt acting on the body tells you how the total p of the body changes over time.RustyDoorknobs said:How is the dp/dt 'added in' to the behavior of the body
The concept of "Two ways of applying force" refers to the two types of forces that can be applied to an object: contact forces and non-contact forces.
Contact forces are forces that require physical contact between two objects to be applied, such as pushing, pulling, or friction.
Non-contact forces are forces that can act on an object from a distance without any physical contact, such as gravity, magnetic force, and electrical force.
Examples of contact forces include pushing a book across a table, pulling a wagon, and kicking a ball.
Examples of non-contact forces include the force of gravity between the Earth and an apple, the magnetic force between two magnets, and the electrical force between two charged objects.