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Dynamics II - Coggle Diagram
Dynamics II
Work
Example
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Energy is transferred from your muscles to the book, increasing it gravitaitonal potential energy
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If a book is lifted 1m in the air, and 2m to the right
When a force causes and object to move through a distance, work is done on the object
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Work is done when a frce moves a body through a horizontal distance, it's done against the frictional forces actinf on the object
Greater the amount of friction, the more work has to be done to move the body through the same distance
Work is done when a body is lifted, there is an increased in the gravitational potential energy store
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Stopping Distance
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Thinking distance = the distance the car travels while the driver reacts to the danger and applies the breaks (reaction time)
Braking distance = the distance the car travels while it is slowing down once the breaks have been applied
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Greater the speed, the greater the distance travelled during the same time
When a force is applied to the breaks of a vehicle, work is done by the brakes onto the wheel, so the vehicles KE reduces and the temperature of the brakes increase
Greater the speed, greater braking force needed to stop the car (over the same distance), the greater force may lead to brakes overheating and loss of control
Elastic potential energy
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Hooke's law
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The spring constant is how stiff a spring is, the larger the value, the stiffer the spring
Eventually the spring will reach its elastic limit, and stop beind proportional to the force applied
Bending requires two force, on anticlockwise and one clockwise
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Elastic deformation is when the material will return to its original shape when the force is removed
Inelastic deformation is when the material won't return to its original shape when the deforming force is removed
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Resultant forces
Resultant force is the single force that would have the same effect as all the other forces acting on the object
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Reaction time
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Measuring rt
Method
1) Ruler is held vertical and exactly level with the person's finger and thumb, the lowest numbers at the bottom
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Interacting forces
Contact forces
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Friction
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The interaction pair is the force of the object on the surface and the force of the surface on the object
Non contact force
Force that doesn't required the objects to be touching, the objects are physically seperated
Gravitational force
Acts between all masses, mass creates a force of attraction
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