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# Chapter 4: Motion and Forces

Difficulty Level: Basic Created by: CK-12

## Introduction

It’s a bird! It’s plane! It’s a super skateboarder! This boy appears to be flying high in the sky, but he can’t stay airborne for long. Gravity will soon pull him back to the ground. How was he able to overcome the force of gravity and rise into the air? In this unit, you’ll learn about forces such as gravity and motions such as skateboarding, including how skateboarders can seem to defy gravity. Along the way, you can also pick up some cool skateboarding tips!

## Summary

This unit includes the concepts of motion, speed, velocity, and acceleration. Forces are introduced, including friction, gravity, elastic force, and forces in fluids. Newton’s laws of motion are examined in detail. The unit also defines work and power, and explains how machines help us do work.

Basic

Nov 01, 2012

## Last Modified:

Apr 29, 2014
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CK.SCI.ENG.SE.1.Physical-Science-Concepts.4