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# Work and Energy

### Chapter 5. Sections 1 thru 3

What is work? Work is force and motion together. The force is intended to cause objects' displacement.
What are the 3 criteria for work? 1. Force. 2. Motion. 3. Force is to be applied in the same direction of the object's motion.
What is Kinetic Energy? Is the energy an object has by virtue of its motion.
The ability to do work is called... Energy
What is the SI unit for Work and Energy? Joule (J) is to be used for both magnitudes.
Energy generally involves______________________ and ____________________. Position and Motion.
What happens when work is done on an object? The work is transferred to cause a change in position or speed.
What does the law of conservation of energy state? The law of conservation of energy states that it cannot be destroyed or created. But also implies it can be converted or transformed from one form into another.
What energy conversions are present when a swinging pendulum goes back and forth? Potential to Kinetic and viceversa
How do an object's potential and kinetic energies change when it is falling to the ground? What happens with the object's mechanical energy? Its gravitational potential energy decreases, as its kinetic energy increases. The object's mechanical energy remains constant.
What equations are to be used when finding: a) kinetic energy, b) gravitational potential energy? a) KE = mV^2/2 b) GPE = mgh
Frictional forces transform mechanical energy into Thermal energy
Describe what happens with the mechanical energy of an object when it is released from certain height. At the beginning the object has certain amount of gravitational energy, which will be in turn converted into kinetic energy. Only a tiny amount of energy is transformed into nonmechanical energies, like thermal and sound.
Why kinetic and potential energies are called FORMS OF MECHANICAL ENERGY? Because they are referred to the motion and position of an object.
How do potential and kinetic energies of an object compare, when the object starts from rest at the top of a frictionless surface and slides down to the bottom of the ramp? Since there is no friction, both energies are exactly the same.
Is the kinetic energy ever negative? What about the gravitational energy? Kinetic energy is never negative since the velocity is to be squared when calculating it. However, the gravitational energy can be negative depending on where the initial position is set.
If the net force acting on an object is found to be zero, what happens with the net work done on the object? what happens with the object's kinetic energy? If the net force exerted is zero, the net work is to be zero as well. The object's kinetic energy remains constant since there is no agent that would accelerate/slow down the object,
Created by: jcfajardo