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Work definition
Mechanical energy transfer - force times distance moved in the direction of the force applied.
Work done by a force definition
Energy transferred when a force moves an object
Work done equation
Work done(J) = force x parallel distance
M x g x height
Work done by a force at an angle equation
W = Fx cos0
1 joule definition
Work done when 1 newton force acts over 1 meter
Gravitational potential energy
The capacity of an object for doing work
as a result of its position in a gravitational field.
What is work done equal to
Gain in GPE
Gain in GPE equation
Mg x h
Condition for GPE equation to work
Close to earth
Kinetic energy
The energy associated with an object as a result of its motion.
Kinetic energy equation
Ek=½mv2
M = mass, V = velocity
Conservation of energy
Principle that energy can’t be created or destroyed, but can be transferred between stores
Uniform gravitational field
Gravitational field where all the field lines are parallel and evenly spaced
Efficiency
Percentage of power or energy applied that goes into its intended use
Energy definition
Capacity to do work
What is happening when work is being done
Energy transferred between energy stores
How is energy conserved during transfer
Amount of energy transferred will equal amount of work done by a force
To gain in one energy store = loss in another
Tf total energy in a closed system = conserved
Gravitational potential energy equation
Mass x 9.8(g) x change in height
Constant definition
Doesn’t change across time
Uniform definition
Doesn’t change across space
Speed of falling object equation (when not constant)
What is necessary for speed of falling object (when not constant) equation
Drag and friction negligble
Height gained of an object fired upwards equation
H = V² / 2g
Power definition
Rate of work done/energy transfer
Power equation
Watts / time
How is power rate of work done
Most objects moving at constant velocity require a constant force to balance resistive forces
As the force is parallel to motion, work is done
Rate of work done equation
Power = F x velo
What does energy most commonly end up as if not useful energy
Thermal energy
Efficiency equation
Useful output energy / total output energy
How to combine efficiencies
Convert to decimals then multiply
