A PHP Error was encountered

Severity: Warning

Message: mkdir(): Permission denied

Filename: drivers/Session_files_driver.php

Line Number: 137

Backtrace:

File: /home/estarbk/public_html/dev.estar-bk.com/application/controllers/Main.php
Line: 8
Function: __construct

File: /home/estarbk/public_html/dev.estar-bk.com/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to initialize storage module: user (path: /var/cpanel/php/sessions/alt-php74)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /home/estarbk/public_html/dev.estar-bk.com/application/controllers/Main.php
Line: 8
Function: __construct

File: /home/estarbk/public_html/dev.estar-bk.com/index.php
Line: 315
Function: require_once

E-STAR - Student

Home Physics PHYSICS: A Textbook for Grade 10   Chapter 3: Work, Energy and Power

E-Lecture - Compound Machines

Most machines, no matter how complex, are combinations of one or more of the six simple machines: the lever, pulley, wheel and axle, inclined plane, wedge, and screw. A machine consisting of two or more simple machines linked in such a way that the load of one machine becomes the effort force of the second is called a compound machine.

For example, consider the can opener shown in Figure 37 (a). The axle has gear teeth on it that grip the can and act as tiny levers to push the can along when the axle turns.

PREV
Go Back to Chapter Details
NEXT
Browse Chapter