EST: Energy, work and power

def and examples

What is energy?

Energy is the capacity of a system to do work or produce an effect. It exists in various forms, such as kinetic, potential, thermal, electrical, and chemical energy.

What is an example of kinetic energy?

When a moving object possesses energy due to its motion, it has kinetic energy. For example, a car moving at a high speed possesses kinetic energy.

What is an example of potential energy?

Potential energy is stored energy that an object possesses based on its position or condition. An example is a stretched spring that has potential energy due to the elastic potential stored in it.

What is work?

Work is the transfer of energy that occurs when a force is applied to move an object over a distance in the direction of the force.

Give an example of work being done against gravity.

When you lift a box from the ground to a shelf, you are doing work against the force of gravity. The energy you exert to lift the box is transferred as work.

How does pushing a cart relate to work?

When you push a cart across a surface, you apply a force and move the cart over a distance. The work you do is transferring your energy to the cart to make it move.

What is power?

Power is the rate at which work is done or the rate at which energy is transferred or transformed. It measures how quickly work is accomplished.

Provide an example of electric power.

When an electrical appliance, such as a light bulb, is connected to a power source and it converts electrical energy into light and heat, the power rating of the bulb indicates the rate at which it uses electrical energy.

How is human power output measured?

When a person performs physical tasks like running, cycling, or lifting weights, the power output measures how quickly work is done. It indicates the rate at which the person expends energy to perform those activities.

What is the summary of this flashcard?

In summary, energy refers to the capacity to do work, work is the transfer of energy by applying force over a distance, and power measures the rate at which work is done or energy is transferred.