work and energy flashcard

Front

What is power in relation to work and energy?

Back

Power is the rate at which work is done or energy is transferred. It depends on both the force applied and the speed at which the work is done.

Front

What is the formula for calculating efficiency?

Back

Front

What does it mean that energy cannot be created or destroyed?

Back

This principle, known as the law of conservation of energy, states that energy can only be transformed from one form to another, but the total energy remains constant.

Front

How do you calculate mechanical advantage in a lever?

Back

Front

What happens to a ball's energy as it falls?

Back

As the ball falls, it loses potential energy and gains kinetic energy.

Front

Define kinetic energy.

Back

Front

Define potential energy.

Back

Front

What is the relationship between work and energy?

Back

Work is done when energy is transferred from one system to another. The amount of work done is equal to the energy transferred.

Front

What is the unit of power?

Back

The unit of power is the Watt (W), which is equivalent to one Joule per second (J/s).

Front

What is the significance of a lightbulb's efficiency?

Back

A lightbulb's efficiency indicates how well it converts electrical energy into useful light energy, with higher efficiency meaning less energy wasted as heat.