Physical Science Honors Final

How does one do work

one must use force to move something a certain distance

When is work not done?

When no force is used or no change in position

Why are machines inherently inefficient?

The output of a machine is always less than the input. This means you are putting more work in than the machine is

What is power?

Power is the amount of work you do per second

What factors affect power?

Work and Time

What is the relationship between work and energy?

Energy must be transferred by force, known as work.

What is energy?

The force that causes things to move

Where does the energy humans use come from?

Carbohydrates

What factor affect the amount of potential energy something has?

Mass, acceleration due to gravity, and height

What factors affect the amount of kinetic energy an object has?

Mass, velocity

How is kinetic energy transferred to potential energy?

An object stops moving or reaches the top of a hill

How is potential energy transferred to kinetic energy?

An object starts moving

What are some forms of non-mechanical energy?

Thermal, acoustic, chemical, nuclear, electrical, radiant

What is fusion?

The act of melting things together

How does fusion work in stars?

Two light nuclei merge to form a single heavier nucleus

How are color, energy, and frequency related?

The color of a light wave impacts the energy and frequency levels. The lighter the color (red, orange,etc), the more energy and higher frequency

What are the different types of waves in the electromagnetic spectrum?

Radio, microwave, infrared, visible light, ultraviolet, x-ray, gamma

Machine

A device with moving parts that work together to complete a task

Simple Machine

An unpowered mechanical device that accomplishes a task with one movement

Work Input

The work that is done on an object

Work Output

The work that an object does resulting from work input

Efficiency

The ratio of usually outwork divided by total input work

What is energy measured with

Joules

What is potential energy?

Energy due to position

What is Gravitated Potential Energy?

The energy of an elevated object?

Kinetic Energy

Energy of motion

Law of Conservation of Energy

Energy can never be created or destroyed

Comes

The basis of color vision

Rods

Photoreceptors in the retina

Additive Primary Colors

Red, green,blue