Chapter 5

investigates the causes of motion and changes in motion.

Push or a pull on a system

act only when one system touches another

act between objects that are not touching

These include compression, which pushes things together;

Which pulls things apart;

Which twists objects;

Which can cause one part of a material to distort or move parallel to the direction of the force relative to other parts.

are magnets and moving electrical charges. affect susceptible materials such as iron, magnets, or moving charges.

Surround and affect electrical charges. All fields extend outward from their sources without limit but their influence weakens rapidly with distance

multiple, simultaneous forces whose pushes and pulls cancel each other out

objects continue moving indefinitely unless some external influence affects their motion.

Objects in motion stay at motion, and objects at rest stay at rest

There has to be more force than the objects mass for it to move F = m x a

For every force exerted on a system by its surroundings, the system exerts an equal but opposite force on its surroundings.

Is everywhere and affects all motion here on Earth

Says that the force of gravity between two objects is proportional to the product of their masses.

An object can experience this condition only in a complete vacuum where there is no air resistance