work+-Energy+problems



**Describe the difference between Kinetic Energy and Potential Energy. **

**How does it relate to what we observed using the Xpult? **

** Work is the force used to move an object some distance **

** W = F x d **

** Force needed to lift the box = 100 Newtons﻿﻿ **

** Distance needed to lift the box = 2 meters **

** 1) What work was needed to move the box 2 meters? ** ** ( N•m is considered a Joule) **

** Mechanical Advantage = Ouput force ** ** Input force **

** 2) The board is 30 meters long. The fulcrum is 3 meters from the Boulder and 9 meters from the person applying the force. A person applies a force of 5 newtons and the boulder is 15 Newtons. **

** What is the mechanical advantage? **

** What is the work being done by the Machine? **

<span style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px;">** What is the work being done by the person? **

<span style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px;">** Compare the Work of the person and machine. **

<span style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px;">** Explain scientifically why the job is easier for the person and harder for the machine. (even though the work is the same) **

<span style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px;">** ﻿ **

<span style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px;">** ﻿ **