Chapter 5 Section 2: What Is a Force?

acceleration of an object

What can a force change?

Unbalanced Force

When the net force on an object is not 0 N; produce a change in motion, such as a change in speed or a change in direction; are necessary to cause a nonmoving object to start moving

When two forces act in opposite directions, you subtract the smaller force from the larger force to determine the net force. The net force will be in the same direction as the larger force.

how to determine net force of forces in different direction

When forces act in the same direction, you add the forces to determine the net force.

how to determine net force of forces in the same direction

Newton

the SI unit of force

Net Force

the combination of all of the forces acting on an object

Balanced Force

when forces on an object produce a net force 0N; will not cause a change in the motion of a moving object; do not cause a nonmoving object to start moving.

Force

A push or a pull exerted on an object in order to change the motion of the object; has size and direction

move

An object can continue to _______ when the unbalanced forces are removed.

produce a net force of 0N, will not cause a change in the motion of a moving object, and do not cause a nonmoving object to start moving

Describe a Balanced Force

produce a net force that is not 0N, produce a change in motion such as change in speed or direction, and are necessary to cause a nonmoving object to start moving

Describe a Unbalanced Force

a light hanging from the ceiling and bird's nest in a tree

Examples of Balanced Forces

kicking a soccerball that is moving in a new direction

Examples of Unbalanced Forces

You cannot see what exerts the force that pulls magnets to refrigerators. And you cannot see that the air around you is held near Earth's surface by a force called gravity

Examples of Unseen Sources and Receivers of Forcer

something has to receive the push

For any push to occur...