CH 12.1 Forces

CH 12.1 Forces

Author: deirdre carney
  • Describe examples of force and identify appropriate SI units used to measure force
  • Explain how the motion of an object is affected when balanced & unbalanced forces act on it
  • Compare and contrast the four kinds of friction
  • Describe how Earth's gravity & air resistance affect falling objects
  • Describe the path of a projectile and identify the forces that produce projectile motion

Nevada Science Standards

P.12.B  Students understand the interactions between force and motion. 

Next Generation Science Standards

HS-PS2-b Use mathematical expressions to support the claim that the total momentum of a system of objects is conserved when there is no net force on the system.


See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

27 Sophia partners guarantee credit transfer.

245 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 21 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.


Introduction to Forces

Pay special attention to definitions of acceleration, speed, and velocity.

Ch 12.1 Forces

Read Chapter 12.1 Forces
Outline the reading in your Science Notebook & include major points and diagrams/tables.
You should focus on the following essential questions:
-How do forces affect the motion of an object
-What are the four main types of friction
-How do gravity and air resistance affect a falling object
-In what direction does Earth's gravity act
-Why does a projectile follow a curved path

Full Screen

Source: Prentice Hall Physical Science - Concepts in Action

Video Clip: Forces in Motion

This video is designed to help students explore the concepts of what a force is, inertia, friction, and balanced vs. unbalanced forces.

Be sure to take notes in your Science Notebook

Video Clip: Galileo's "falling bodies" demo

Recreation of Galileo's experiment. Pay attention to gravity and air resistance relationship.
Take notes in your Science Notebook.

Video Clip: Bill Nye - Friction

Explore the affect of friction on motion. Take notes in your Science Notebook.