Energy
What is energy measured in?
Joules
Electrical to Thermal
How much work is put in if I push a box 50 N for a distance of 50 m.
2500 J
GPE
P= Work / time
Measure of a systems ability to move or change matter. DAILY DOUBLE
Energy
Law of Conservation states what about energy?
Energy cannot be created or destroyed only transferred or transformed.
Joules (J)
Equation for KE
1/2 x m x v^2
What do we measure power in or what is the unit for power?
Watts (W)
A system in which neither matter or energy crosses the boundaries anywhere.
A closed system
A rollercoaster has what forms of energy present?
Potential, Kinetic, Mechanical
What does the F and d variables stand for in one of the work equations?
F= force
d= distance or displacement
Type of energy due to the motion of an object.
Kinetic Energy
If a motor puts 5000 J of work into a car over 20 seconds how much power did it take?
250 W
Mechanical Energy
When charging a phone you are going from what form to what form?
Electric to Chemical
How much work is needed to lift a box if it weighs 10 kg and I am 15 meters above ground?
1,470 J
If the equation for EPE is 1/2 x k x x^2 what does the variable x stand for? DAILY DOUBLE
Displacement from the equilibrium
What is the equation for mechanical energy?
ME=KE + PE
Solar or wind power are examples of what type of energy source?
Renewable Energy
If a dam is holding water then, allows it to flow down into turbines, which then power a generator what is the 3 energy conversions happening in order?
Potential to Kinetic to Electric
What are the 2 equations we use to calculate work and when do we use them?
W= F x d (use when we push something horizontally)
W= m x g x h (use when we lift an object above the ground)
What is springs constant measured or what unit do we use in the EPE equation?
Newton Meter (N/m)
What are the 2 equations we can use to calculate conservation of energy?
KE(i)+PE(i)=KE(f)+PE(f)
KE=PE