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FORCES IN ACTION, MOMENTS, FORCE TYPES, NEWTONIAN LAWS, DISTANCE TIME…
FORCES IN ACTION
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Contact forces include: air resistance, friction, tension, thrust, upthrust
MOMENTS
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If an object is balanced, the total clockwise moment about a pivot = total anticlockwise moment
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To calculate the moment, you measure the perpendicular distance between the pivot and the force
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When an object is balanced, its total clockwise moment = total anticlockwise moment
a lever works by transmitting the turning effect of a force, multplying the force
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FORCE TYPES
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Non contact forces include: gravitational force, electrostatic, and magnetic
The resultant force of an object is the overall force acting on the object in one direection: when the two forces are in the same direction they add, if they oppose then subtract
When the resultant force is 0, the object is stationary or moving at a constant speed. If it isnt 0, the object is accelarating
NEWTONIAN LAWS
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1st LAW :If the resultant force acting on an object is zero, the object will remain at rest or continue to move at constant velocity.
2nd LAW:The acceleration of an object is proportional to the resultant force and inversely proportional to its mass. ( f= m x a)
3rd LAW:When two objects interact, they exert equal and opposite forces on each other.
DISTANCE TIME GRAPHS
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In a distance time graph, if the line is flat, the velocity is constant