Physics - Mechanics - Forces, moments and pressure

Detailed notes that will help when revising for mechanics

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Chapter 5: Forces, moments and pressure
Some important forces
Pushed and pulls
Pushing and pulling
Lifting
Force or car engine
Attraction and repulsion magnets
Weight
Any object in the gravitational field
Less on the moon
Friction
Pulling an object along the ground
Vehicles cornering or skidding
Sliding down a slope
Drag
Vehicles moving
Aircraft flying
Parachuting
Objects falling through air or water
Ships sailing
Up thrust
Boats or icebergs floating
People swimming
Divers surfacing
A hot air balloon rising
Contact force
Standing on the ground
One object sitting on top of another
Leaning against a wall
One object bouncing off another
Tension
Pulling with a rope
Squashing or stretching a string
Centre of gravity

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We have weight because of the force of gravity
Every part of our body experiences a force
It's a lot easier to picture the overall effect of gravity at a single point
The centre of gravity of an object is defined as a point where the entire weight of the object appears
to act
Finding the centre of gravity
If you have an irregular shape then make three or four holes around the object
Attach a pin to a clamp stand and the pin the…read more

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It is calculated using the word equation
Density (kg/ms3) = mass (kg) / volume (m3)
Pressure
Pressure tells us about how the force is shared out over the area it acts on
The larger the area the smaller the pressure, for a given force
It is calculated using the word equation
Pressure (Pa) = Force (N) / cross-sectional area (m/s2)
Summary
The centre of gravity of an object is defined as the point through which the entire weight of the
object may be considered to…read more

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