Simple Machines Big

Third class

A lever in which the effort force is applied between the fulcrum and the resistance force.

First class lever

A lever in which the fulcrum is located between the effort and resistance forces.

Second class lever

A lever in which the load is between the fulcrum and the effort force.

wheel and axle

A simple Machine used to reduce friction, and decrease the amount of force needed to do work.

screw

A simple machine that decreases the force needed to move an object, an inclined plane wrapped around a cylinder. (threads)

pulley

A simple machine that helps lift a load higher while requiring the same amount of force

wedge

A simple machine used to split a solid object with less force, made of two inclined planes.

inclined plane

A simple machine with a slanted surface that decreases the amount of force needed to move an object

Lubricant

A substance that reduces friction between two surfaces.

Newton

A unit used to measure force.

Joule

A unit used to measure work.

work

Accomplished when an object moves as a result of a force.

crowbars, pliers, seesaw, scissors

Examples of first class levers

Nut crackers, crab leg crackers, wheelbarrows, bottle openers

Examples of second class levers

tweezers, hammers, shovel

Examples of third class levers

Effort

Force needed to move the load.

friction

Force that resists movement between two surfaces

Mechanical Effiency

Measures the effectiveness of the machine.

simple machines

One of six objects that require manual force to perform work includes levers, pulleys, wheels and axles, inclined planes, wedge, and screw

lever

Simple machine made of a fulcrum, arm, load, and effort. Reduces the amount of force needed to do work.

Mechanical Advantage

When the machine takes a small input force and increases the magnitude of the output force.

The mechanical advantage of an incline plane

length / height of ramp

load

object being lifted or moved

force

push or pull