Work: As Change in Energy
About the Lecture
The lecture Work: As Change in Energy by Jared Rovny, PhD is from the course Work.
Included Quiz Questions
Which statement is TRUE about throwing an object upward in the air?
- It loses kinetic energy. Gravity does negative work.
- It loses kinetic energy. Gravity does positive work.
- It gains kinetic energy. Gravity does negative work.
- It gains kinetic energy. Gravity does positive work.
- Its kinetic energy remains unchanged because energy is conserved.
You throw an object in the air, and it stops moving at its apex. What has happened to its initial kinetic energy?
- It converts by work of gravitational force into gravitational potential energy.
- It converts into work according to the work-energy theorem.
- Due to the conservation of energy, it is unchanged.
- It converts into the heat of the air molecules around it.
- It has changed the direction of its initial kinetic energy using work.
Which statement is an accurate description of the work-energy theorem?
- The total work done on an object is equal to its change in kinetic energy.
- The total work done on an object will equal its change in total energy.
- The work of a force exerted on an object is equal to the change in its kinetic energy even if there are other forces.
- The work done in a particular direction is equal to the change in the energy in that direction.
- The work done on an object equals the potential energy it loses.
An object with mass m falls from height h. What is its kinetic energy before hitting the ground?
- K = mgh
- K = 2mgh
- K = mgh/2
- K = gh
- K = -mgh
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Author of lecture Work: As Change in Energy
Jared Rovny, PhD
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every concept is made very simple and as short as possible
