Pressure is defined as the force per unit area applied perpendicular to a surface. It is useful for understanding weight, space travel by knowing safe distances from planets, and measuring blood pressure which is important for health. Pressure can be calculated as force divided by area. Moments are the turning effect of forces on objects with fixed points like hinges or axles, causing them to rotate. Moments are calculated as the force times the distance from the pivot point.

1. Pressure and MomentsPressure and Moments
By M HBy M H

2. ContentsContents
• Pressure……………………………………..Pressure……………………………………..
Slide 3Slide 3
• How to work outHow to work out
Pressure…………….Slide 4Pressure…………….Slide 4
• Moments……………..........................SlideMoments……………..........................Slide
55
• How to work out Moments……………SlideHow to work out Moments……………Slide
66
• The end………………………………………The end………………………………………

3. PressurePressure
• Pressure is the force per unit area applied in aPressure is the force per unit area applied in a
direction perpendicular to the surface of andirection perpendicular to the surface of an
object.object.
• Pressure is very useful when trying to know whatPressure is very useful when trying to know what
your weight is and going to space because youyour weight is and going to space because you
have to know how far you can be from a planethave to know how far you can be from a planet
and not being attracted or bounced of it’sand not being attracted or bounced of it’s
gravitational force.gravitational force.
• Pressure is useful when trying to know whatPressure is useful when trying to know what
someone’s blood pressure is. If we never knewsomeone’s blood pressure is. If we never knew
what pressure was then people’s lives could bewhat pressure was then people’s lives could be
at riskat risk

4. How to work out pressureHow to work out pressure
• Pressure = fore divided by area.Pressure = fore divided by area.

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

6. How to work out a momentHow to work out a moment
• Moment=Force times the distance formMoment=Force times the distance form
the pivot.the pivot.
D F
M

7. TheThe
EndEnd