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Ch4S1
Efficiency
Increases the force on an object.
Increase the distance that force is applied.
Change the direction of the applied force.
NO MACHINE Can Increase both speed & force at the same time.
YOU ALWAYS put more work into a machine than you get out of the machine
Its equation is efficiency= output work in joules/ input work in joules x 100. e= Wout/ Win x 100
Work
In normal life work is something for earning money
But in science is the force applied through distance
Its formula is Work= applied Force x distance; W=Fd
When force and motion are parallel (means the same direction)
Work is measure in joules.
When force and motion are perpendicular means the work from that force is 0.
Machines
Is a device that changes the force or increases the motion from work.
Simple machines
There are 6 types of simple machines
Lever
It amplifies the input force providing a greater output force. It is a bar that is used to help move a heavy load.
Whee and axle
It changes the force by changing the distance from where the force must be applied. The input force is reduced to the output. This simple machine is a wheel or round disk which has an axle through its center.
Pulley
They reverse the direction of the rope by pulling down on a rope. With a two-wheel pulley, you lift the same amount of weight but with half the effort.
Inclined plane
It consists of a sloping surface that is used to raise heavy objects. The force you will excerpt will be less than the weight being raised. The more incline the slope the nearly the force approaches the actual weight.
Wedge
It can be used to separate two objects or portions.
Screw
It is a cylindrical member that is used either as a fastener or as a motion modifier. Also, it is used to join parts together.
Compound machines
Is a combination of two or more simple machines.
Scissors, wheelbarrow, drill, are some examples.
Mechanical advantage
The effectiveness of a machine at increasing force.
If MA = less than 1 the input force is greater than the outpout.
If MA = 1 the machines just changes the direction of the force.
If MA= is greater than 1 the machines increases force.
Equation mechanical advantage = output force in newtons/ input force in newtons. MA= Fout/Fin
By: Santiago Flores
