Energy Summative Flashcards
What is Work?
The amount of force applied to an object (in the same direction as the motion) over a distance. If the force being applied is not in the same direction as the movement, no work is being done.
What is Work Measured in
Joules
What is the equation for work?
Work (J)= Force(N) X Distance (m)
What is Force measured in?
Newtons
What is Distance Measured in?
Meters
What is the equation for work done against gravity?
Work= Mass x Gravity x Height
What is the Gravity Unit?
9.8 m/s
What is Power?
The amount of work done in a certain amount of time. The rate at which work is done. If two people do the exact same amount of work, the person who does that work the fastest has the highest power output.
What is Power Measured in?
Watts
What is the equation for Power?
Power (W) = Work (J) / Time (S)
What is Potential Energy?
The energy that is stored in an object due to its position. It depends on the mass and height of the object. Increasing mass or height of the object results in a greater potential energy. If something is on the ground, it will have zero potential energy.
What is Potential Energy Measured in?
Joules
What is the equation for potential energy?
Potential Energy (J) = Mass (kg) x Gravity (9.8 m/s) x Height (m)
What is Kinetic Energy?
The energy possessed by an object due to that object’s movement. Depends on the mass and speed of the object. Increasing the mass or speed of the object results in an increase in kinetic energy. If an object is not moving, it will have zero kinetic energy.
What is Kinetic Energy Measured in?
Joules
What is the formula for Kinetic Energy?
Kinetic Energy (J) = 1/2 x Mass(kg) x Velocity^2(m/s)
What does the total energy of the system include?
all of the potential energy of the system added together with all of the kinetic energy of a system
What is the efficiency of a system?
How much energy was put into a system, divided by how much energy comes out.
What is efficiency
The energy before and after. If the efficiency is not 100%, then it is not all kinetic. If the rubber band, for example, is not 100% efficient, then it will not give all energy back. Also due to friction.
What is the result of Lower Efficiency?
Object going slower, Less Ke
What is the result of Higher Efficiency?
Object going faster, More Ke
