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Basic
Physics
- Scalars: quantities with magnitude only
- examples
- density,mass,volume,time,length,work etc
- density,mass,volume,time,length,work etc
- examples
- Vectors: quantities with magnitude and direction
- examples
- displacement,velocity,acceleration,force,momentum,gravitational field strength
- displacement,velocity,acceleration,force,momentum,gravitational field strength
- examples
- Newton's Third
law
- If a body A exerts a
force on body B, the
body B exerts an equal
and opposite force on A.
- identify a newton pair:
- the forces
must be of
the same
type
- the forces
act on
different
objects
- the forces
must be of
the same
type
- If a body A exerts a
force on body B, the
body B exerts an equal
and opposite force on A.
- Free Body diagrams
- arrows must touch objects
- draw arrows approximately to scale
- arrows must originate from where the force is acting
- arrows must touch objects
- Newton's
Second Law
- F=ma
- F=ma
- M= 1/gradient
- TRIGNOMETRY
- Components of Vectors
- the components of a vector are usually determined in 2 perpendicular directions
- Vertical Component: sin
- Horizontal Component: cos
- Vertical Component: sin
- the components of a vector are usually determined in 2 perpendicular directions
- DENSITY: mass/volume
- MOMENTS
- Moment= f*d
- Equlibrium
- A body is in equilibrium when
- no resultant
force acts on
the body
- the net moment
about any point are
zero
- no resultant
force acts on
the body
- A body is in equilibrium when
- PRINCIPLE OF MOMENTS
- Clockwise moments = Anti clockwise
moments
- Sum of vertical forces is Zero
- F1 + F2 - R = 0
- F1 + F2 - R = 0
- Clockwise moments = Anti clockwise
moments
- Moment= f*d
- CENTRE OF GRAVITY
- A point where
the weight of the
body or system
may be
considered to act
- A point where
the weight of the
body or system
may be
considered to act
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