last science test!! chapter 1,2

Define the word system.

The word system is a group of parts that work together to perform a task.

Define gravitational force, friction, static friction, sliding friction, and lubricant.

-Gravitational force is the force that pulls objects towards the Earth’s surface.

-Friction is the force that stops and object from sliding over another surface.

-Static friction is the force that holds an object in place preventing it from sliding.

-Sliding friction is the force that acts like a brake when an object is sliding over another surface.

-Lubricant is a substance that causes objects to slide easily.

Define physical systems and social systems with examples of each.

-Physical systems are systems where unconscious parts work together to perform a task.

Example: Cars

-Social systems are systems where conscious parts work together to perform a task.

Example: Orchestras

How are physical systems and social systems the same and how are they different?

They both are systems that have parts working together to perform a task. They’re different because physical systems are unconscious parts and social systems are conscious parts.

What is the difference between an input and an output in a system?

An input is the force and energy you put into a system and an output is the outcome.

What’s the difference between mass and weight?

Mass is the amount of matter in an object and weight is how strong a gravitational force is between 2 objects.

Describe what “work” is in science.

“Work” in science means that if you moved an object you did work.

All forces have 2 parts, what are they? And describe it.

Magnitude and direction. Magnitude is how strong the force is. Direction is the way the force is pushing or pulling.

What are side effects? What is systems thinking?

Side effects are undesired outcomes. Systems thinking is taking in consideration about inputs, outputs, and side effects.

Why is it so important to think of side effects when you use systems thinking?

To prevent side effects from happening.

Describe how the waste management systems have changed over time.

All types of garbage used to be piled up, now we burn them, recycle, separate poisonous and dangerous garbage.

What are the 6 simple machines?

Lever, wheel and axle, pulley, inclined plane, screw, wedge.