Machines, Mechanisms, and Motion Conversion
How machines help people
Simple machines
Simple machines make work easier by changing the size or direction of a force. Examples include levers, pulleys, gears, inclined planes, wedges, and screws.
Mechanical advantage
Mechanical advantage describes how much a machine multiplies force. A machine can reduce the force needed, but it usually increases the distance or time needed to do the task.
Core idea
Machines do not create energy from nothing. They trade force, distance, and direction in useful ways.
Examples of mechanisms
Lever
- Uses a pivot
- Can lift or pry with less input force
Gear system
- Transfers rotation
- Can change speed and torque
What does a lever use?
Levers rotate around a pivot, also called a fulcrum.
Correct answer: A pivot point
Mechanical advantage mainly helps by changing what?
It trades input force against distance or speed.
Correct answer: Force and distance
Name one simple machine.
Simple machines make tasks easier by changing force or motion.
Correct answer: Lever, pulley, gear, inclined plane, wedge, or screw.
Does a machine create energy from nothing?
Machines transform energy and trade force for distance or direction.
Correct answer: No.