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Work and Energy
Chapter 5. Sections 1 thru 3
| Question | Answer |
|---|---|
| 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
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