Physics Concepts: Work, Energy, and Electricity

Front

What is the golden rule of mechanics?

Back

What you gain in force, you lose in distance.

Front

What are simple machines mentioned in the text?

Back

Levers, inclined planes, wedges, screws, wheels, and pulleys.

Front

What is a lever?

Back

A stick that can turn around a point called the pivot or fulcrum.

Front

How does a lever work?

Back

If the load is close to the pivot, it's easier to lift; if your hands are far from the pivot, you don't need to push as hard.

Front

What is a pulley?

Back

A simple machine that helps lift heavy things by changing the direction of your pull.

Front

How does adding more wheels (blocks) to a pulley help?

Back

It reduces the force needed to lift something heavy.

Front

What is an inclined plane?

Back

A ramp that helps make heavy lifting easier by allowing you to slide or roll an object.

Front

What is physical work?

Back

Physical work happens when you overcome a force and move an object in the direction of that force.

Front

How do you calculate work?

Back

Work (W) = Force (F) × Distance (s).

Front

What is energy?

Back

Stored work that lets things move or do something.