Work, Energy, and Power Review

Flashcards covering key concepts from 'Work, Energy, and Power Review' lecture notes.

What is energy?

Energy is the ability for an object to do work.

What are the two categories of energy?

Energy can be classified into kinetic and potential.

What is kinetic energy?

Kinetic energy is energy associated with motion.

What is potential energy?

Potential energy is stored energy that has the potential for doing work.

What is the work equation?

Work (W) = Force (F) multiplied by distance (d).

What unit is work measured in?

Work is measured in joules (J) or newton-meters (N*m).

How is power defined?

Power is the amount of work done over a certain time interval.

What is the unit of power?

Power is measured in watts (W) or joules per second (J/s).

If a force doubles, what happens to the work?

If the force doubles, the work done also doubles since work is directly proportional to force.

What does gravitational potential energy depend on?

Gravitational potential energy depends on mass, gravitational acceleration, and height.

What is the formula for gravitational potential energy?

PEg = mass (m) × gravitational acceleration (g) × height (h).

What is the formula for elastic potential energy?

PEs = ½ k × x², where k is the spring constant and x is the distance stretched or compressed.

What happens to gravitational potential energy as an object falls?

Gravitational potential energy is converted into kinetic energy as the object falls.

What is the work-energy theorem?

The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy.

Is work being done when holding an object stationary?

No, when holding an object stationary, no work is done because there is no movement.

What is the outcome of applying a force without movement?

If a force is applied without movement, no work is done, and the energy of the system does not change.

If velocity increases, what happens to kinetic energy?

If velocity increases, kinetic energy increases, specifically the kinetic energy increases with the square of the velocity.