Pressure and MomentsPressure and Moments

By M HBy M H

Contents Contents

• Pressure……………………………………..Slide 3Pressure……………………………………..Slide 3

• How to work out Pressure…………….Slide 4How to work out Pressure…………….Slide 4

• Moments……………..........................Slide 5Moments……………..........................Slide 5

• How to work out Moments……………Slide 6How to work out Moments……………Slide 6

• The end………………………………………Slide 7The end………………………………………Slide 7

PressurePressure• Pressure is the force per unit area applied in a Pressure is the force per unit area applied in a

direction perpendicular to the surface of an object.direction perpendicular to the surface of an object.• Pressure is very useful when trying to know what Pressure is very useful when trying to know what

your weight is and going to space because you have your weight is and going to space because you have to know how far you can be from a planet and not to know how far you can be from a planet and not being attracted or bounced of it’s gravitational force.being attracted or bounced of it’s gravitational force.

• Pressure is useful when trying to know what Pressure is useful when trying to know what someone’s blood pressure is. If we never knew what someone’s blood pressure is. If we never knew what pressure was then people’s lives could be at riskpressure was then people’s lives could be at risk

How to work out How to work out pressurepressure

• Pressure = fore divided by area.Pressure = fore divided by area.

MomentsMoments

• Forces that act on objects that have Forces that act on objects that have a fixed point - such as the hinge of a a fixed point - such as the hinge of a door, or the axle of a wheel - may door, or the axle of a wheel - may make that object rotate. We call the make that object rotate. We call the turning effect of a force the moment.turning effect of a force the moment.

How to work out a How to work out a momentmoment

• Moment=Force times the distance Moment=Force times the distance form the pivot.form the pivot.

D F

M

The The EndEnd