# Shared Flashcard Set

## Details

Physics Ch. 2 - Work and Energy
MCAT
6
Physics
04/15/2016

Term
 What formula determines kinetic energy?
Definition
 K = 1/2mv2 K is kinetic energy m is mass v is velocity
Term
 Equation for potential energy
Definition
 U = mgh U is potential energy m is mass g is gravity h is height
Term
 What is work defined as?
Definition
 The process by which energy is transferred from one system to another.
Term
 Equation for power and the units of power
Definition
 P = W/t P is power in Joules/second (J/s) W is work in in J t is time in s
Term
 What is mechanical advantage and how is it determined?
Definition
 Mechanical advantage = Fout/Fin F's represent the force exerted on an object by a simple machine (Fout) and the force applied to the machine (Fin)
Term
 How do pulleys decrease the force needed to move an object?
Definition
 The pulley makes it so that two strings are supporting the weight of the object. Now when the string is pulled the object will move half the distance of the length of string pulled but this will only require half of the original force necessary. Every pair of pulleys added equals a twofold decrease in force needed but a twofold increase in length of rope. ie 2 pairs of pulleys = 4 times, 3 pairs of pulleys = 6 times
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