Work is a force acting through a ________
A ___ (_____ ______) is equal to one joule.
NM (Newton Meter)
Work is measured in ________ (__)
A ________ machine does work with only ONE motion or movement.
Machines make work easier by changing the _____ of the ______ exerted or the _________ of the force or both.
Size of the force
Distance of the force
The force applied to or on the machine or the ________ force.
The force applied by the machine is the ___________ force.
The number of times a machine multiplies the effort force is called the ______________ ____________.
THe measure of how much useful work put into a machine is changed is useful fork put out by the machine is called ____________.
Efficiency is always less than 100% because of ________.
The distance the effort force moves called ________ distance.
The distance the resistance moves is called ____________ distance.
The work done on or to the machine is called work _______.
The work done by the machine is called work ________.
What is the formula for work input?
Wi = Fe*dE
Work input = Effort force * Effort Distance
What is the formula for work output?
Wo = Fr*dR
Work output = Resistance force * Resistance Distance
What is the formula for mechanical advantage?
MA = Fr/Fe
Mechanical advantage = Resistance force / Effort Force
What is the formula for efficiency?
EFF = Wo / Wi*100%
Efficiency = Work output / Work input * 100%
What is the formula for power? (More than one)
P = W / T
Power = Work / Time
P = F*D / T
Power = Force * Distance / Time
_______ is the rate at which work is done.
James Watt used the term ___________ to express the power of his machines.
One horsepower is about equal to ______ watts.
One kilowatt = ________ watt
A bar that is free to pivot or move about a fixed point is a ________.
What is an example of a first class lever?
See saw, pliers, and scissors
What is an example of a second class lever?
Wheel barrow, door, and paper cutters
What is an example of a third class lever?
Bat, broom, and oar
A _______ pulley is attached to something that does not move.
A ________ pulley has a mechanical advantage of one.
A ____________ pulley moves with the effort force and multiplies effort force.
A ___________ pulley has a mechanical advantage greater than one.
A slanting surface used to raise objects is an _________________.
An inclined plane that moves is called a ________.
To increase the mechanical advantage you make the wedge _________, ________, or even __________ it.
Longer, thinner, or even sharpen it
A combination of two or more simple machines forms a ___________ machine.
__________ ______- Where the fulcrum is between the effort and resistance force.
First Class Lever
__________ ______- Where the resistance is located between the effort force and fulcrum.
Second Class Lever
_________ _______- Where the effort force is between the resistance force and fulcrum.
Third Class Lever
What are the six types of simple machines?
A lever, pulley, wheel & axle, screw, inclined plane, and wedge
Power is measured in __________ per _______ or _______.
Joules per second or watts
A grooved wheel with a rope or chain running along the groove is a _______.
Combining fixed and moveable pulleys gives them greater ___________ ____________.
To calculate the mechanical advantage of a pulley system ( Block and Tackle System) you ________________________.
Count the number of supporting strings holding them up.
A ___________ is a device that makes work easier.