# Force - Hammer Science Bell Ringer Name three types of forces and what they do. Forces Basic Definition for Force Force is most easily defined as a:

PUSH or a PULL Units: N (Newtons) Purpose of Forces To change an objects state of motion!!! Understanding Forces

Contact: Non-contact: Normal Force Gravity Tension Electromagnetic

Friction Normal Force A support force --It supports the weight of things Direction: Always!!!!! Perpendicular to the surface

Tension Forces in Ropes and Strings Direction: Follows the rope or string Friction

Force that resists motion Direction: Opposite the motion of object Parallel to surface Force Diagrams!!!! We use these to analyze the forces acting ON an object

To make a force diagram you follow three simple steps: 1. Replace the object with a dot 2. Draw the Non-contact forces ---For now we will only be using gravity 3. Draw the Contact forces ---Answer the question: What is touching the object? Practice

T N For the piano Fg For the wagon Ff N

Fg Ff For the car Fp Fg

T