Simple Machines Flashcards
Device that makes doing work easier
Machine
Machine that does work with only one movement of the machine
Simple Machine
Two or more simple machines that operate together
Compound Machine
Bar that is free to pivot around a fixed point
Lever
Fulcurm is between the input force and output force
1st Class Lever
Output force is between fulcrum and input force
2nd Class Lever
Input force is between fulcrum and output force
3rd Class Lever
Grooved wheel with a rope, chain or cable running along groove
Pulley
Attached to output force something that doesn’t move
Fixed pulley
One end of the rope is fixed and the wheel is free to move
Moveable pulley
System with a combination of fixed and moveable pulleys
Compound pulley
Pulleys with grooved wheels designed to be fitted with a cable or rope and to turn freely within a block
Block and Tackle
Consists of an axel attached to center of larger wheel so that the wheel and axel rotate together
Wheel and Axel
Sloping surface, such as a ramp that reduces the amount of force required to do work.
Inclined Plane
An inclined plane wrapped in a spiral around a cylindrical post
Screw
Inclined plane with one or two sloping sides
Wedge
Calculation for work
Work = Force x Distance
How do machines make work easier?
By increasing the force that can be applied to an object
What are the two forces that are applied when a machine does work?
Input and Output Force
The force applied to machnes
Input Force
The force applied by machine
Output Force
What is the ratio of the output force to the input force.
Mechanical Advantage
What is the formula for calculating mechanical advantage?
Mechanical Advantage = Output Force/Input Force
Measures how much work put into a machine is changed into useful output work
Efficiency
How can machines be made more efficient?
By reducing friction
