Simple Machines Flashcards
Joules
The unit to used to measure work
Work
The result of a force moving an object over a distance
Newtons
Unit used to measure force
Speed
How fast an object goes in a certain amount of time
Distance
How far something moves
Energy
The ability to do work
Kinetic energy
Energy of motion
Potential energy
Stored energy
W=F*D
Work equal force times distance
Machine
A tool used to make work easier
Simple machine
Usually consists of 1 or 2 parts
Lever
A rigid bar that turns around a fulcrum
1st class lever
The fulcrum is between the effort and load
Examples of 1st class machines
Seesaw, scissors, pliers
2nd class lever
The load is between the effort and the fulcrum
Examples of 2nd class levers
Wheel barrel, nut cracker, paper cutter
3rd class lever
The effort is between the fulcrum and the load
Examples of 3rd class levers
Tweezers, broom, baseball bat, fishing pole
Wedge
A double inclined plane. Most commonly used to push apart
Examples of wedges
Door stop, axe, knife, shoehorn
2 types of Wheel and axles
Fixed axles and non spinning axle
Fixed axle
Wheel and axle roll together
Non Spinning axle
Axle stays still, wheels move at different speeds
3 types of pulleys
Fixed pulleys, movable pulley, block and tackle
Fixed pulley
Its built to a higher level
Movable pulley
Moves with load
Block and tackle pulley
Combination of 2 types of pulleys : fixed and movable pulleys
Screw
Inclined plane fixed around a wedge Screws enable things to move
