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Forces 1
Descripción
Following GCSE AQA syllabus: 4.5 - 4.5.4
Sin etiquetas
forces and interactions
work done
forces and elasticity
physics
5) forces
year 10
Mapa Mental por
Sifat Symum
, actualizado hace más de 1 año
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Sifat Symum
hace más de 7 años
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Resumen del Recurso
Forces 1
Quantities
Scalar
Scalar quantities only have magnitude (size)
Vector
Vector quantities have both magnitude and direction
These can be represented by arrows
Length of arrow determines magnitude
Direction of arrow represents direction
Contact and Non-contact forces
A force is a push or pull that acts on an object due to the interaction with another object
contact forces – the objects are physically touching
Friction
Air resistance
non-contact forces – the objects are physically separated
Gravitational force
Magnetic Force
Weight and Gravity
Weight = mass x Gravity
W = mg
Weight, W, in Newtons, N
mass, m, in kilograms, kg
gravitational field strength, g, in N/kg
The weight of an object is directly proportional to mass
Mass is how much matter is contained within a body.
Mass remains constant regardless of gravity
Weight is the force of gravity acting upon a mass
The weight changes according to the gravitational field strength
Weight is measured using a Newtonmeter
Work done and Energy Transfer
A resultant force is the overall representation of all of the forces acting upon a body
It is a single force that has the same effect of multiple forces combined
Work done = Force x distance
W = F x s
Work done, W, in joules, J
distance, s, in metres
Force, F, in newtons, N
One joule of work is done when a force of one newton causes a displacement of one metre
1 joule = 1 newton-metre
Forces and Elasticity
Deformation
This means to change an object's shape
force = spring constant x extension
F = k x e
Force, F, in newtons, N
spring constant, k, in newtons per metre, N/m
extension, e, in metres, m
This relationship also applies to the compression of an elastic object, where ‘e’ would be the compression of the object
When a force stretches or compresses a spring work is done
Elastic potential energy is then stored
Provided the spring is not deformed...
The work done on the spring and stored elastic potential energy will be equal
Moments
Moment = Force × distance
M = F x d
moment of a force, M, in newton-metres, Nm
force, F, in newtons, N
distance, d, in metres, m
This is is the perpendicular distance from the pivot to the line of action of the force
If an object is balanced, the total clockwise moment about a pivot equals the total anticlockwise moment about that pivot
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