Work and Machines

Work and Machines

​Force and Work

Force - is a push or pull. It is measured in Newtons (N)
Work is done when an object moves in the direction of a force. It is measured in Joules (J) or Newton meters (Nm).
In science work can be calculated by using the formula
Work = force x distance. {w=fxd}

​Which image shows work being done?

Sample Question:

​Jason lifted a 10N box from the car that is 5m away. Calculate how much work was done?

Work = Force x Distance
Work= 10N x 5m
Work = 50Nm

Machines

What is a machine?

​A machine is a device or tool used to make work easier. It makes work easier by increasing your force OR changing the direction of the force.

Simple machines:
There are 6

​A slanted surface used to push objects up or down.
eg. ramp, slide, staircase

​​Inclined plane

​Its an inclined plane wrapped around a pole. used to fasten objects together. eg. jar lid, drill bit

​​Screw

​A belt, rope or chain moves over a grooved wheel. Used to pull the load up or move along with the load. eg flag pole, well

​​Pulley

​Made up of a wheel that turns about a rod that is in the center. eg. ferris wheel, steering wheel

​​Wheel and Axle

​Made up of a bar or rod that turns about a fixed point called a fulcrum.
eg. see-saw, crowbar, baseball bat

​​Lever

​Made up of two inclined planes together. used to split or divide objects. Eg. axe, knife.

​​Wedge

A compound machine is a machine made up of two or more simple machines.

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​Compound machines