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forces pt.1 - Coggle Diagram
forces pt.1
gravity
Gravity is one of the most important forces in the universe. An object with mass in a gravitational field experiences a force known as weight.
weight is a non-contact force because gravity exerts its force through a field. an object does not need to be touching the Earth to have a weight.
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Where there is a weaker gravitational field, the weight of an object is smaller
the weight of an object may be thought of as acting at a single point called its centre of mass. depending on the object's shape, its centre of mass can be inside or outside it.
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the greater the mass of the object, the greater its weight
weight, mass
and
gravitational field strength
weight = mass × gravitational field strength
- weight (W) is measured in newtons (N)
- mass (m) is measured in kilograms (kg)
- gravitational field strength (g) is measured in newtons per kilogram (N/kg)
calculating work done
To calculate the work done on an object when a force moves it, use the equation:
- W = Fs
- work done = force × distance
- work done (W) is measured in joules (J)
- force (F) is measured in newtons (N)
- distance moved along the line of action of the force (s) is measured in metres (m)
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diagrams
free body diagrams
a free body diagram models the forces acting on an object. the object or 'body' is usually shown as a box or a dot. the forces are shown as thin arrows pointing away from the centre of the box or dot.
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vector diagrams
Draw a right-angled triangle to scale, in which each side represents a force.
