Forces

BellworkStart a new page in your

notebook titled “Bellwork Week 3”

What do you think a “force” is?

ForceA push or a pull exerted on an

object in order to change the motion of the object

Force has a size (magnitude) and a direction

FrictionA force that opposes motion

between two surfaces that are in contact.

Net ForceThe combination of all of the

forces acting on an object

Balanced ForceA set of forces on an object that

cancel one another out so that there is no overall force on that object;

the combined force is the same as zero force;

balanced forces will not cause a change in the motion of an object

Unbalanced ForcesA set of forces exerted on an object

that change the motion of that object

The combined for has size (magnitude) and direction

Unbalanced forces are needed to make an object start moving, speed up, slow down, or change direction

InertiaThe tendency of an object to

resist being moved or, if the object is moving, resist a change in speed or direction

Newton’s 2nd LawForce = Mass X Acceleration