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# Work and Machines (Ch 9)

Name:________________________
Class: ___________ Date: ________
Across
The ideal MA of a wedge is found by dividing the length of the wedge by the _____.
_____ is done on an object when the object moves in the same direction in which the force is exerted.
The ideal mechanical advantage of a pulley or pulley system is equal to the number of sections of rope that ______ the object.
______-class levers increase force. They do not change direction.
The closer together the threads of a screw, the _____ the mechanical advantage.
The machine exerts the ______ force.
An examples of second-class levers include nutcrackers and _____ openers.
The _____ of output force to input force is the mechanical advantage of a machine.
A machine's mechanical ____ is the number of times a machine increases a force exerted on it.
The _____ of a machine compares output work to input work.
One ______ equals 1,000 watts.
A _____ is an example of a simple machine called an inclined plane.
The ideal mechanical advantage of a wheel and axle is the _____ of the wheel divided by the ______ of the axle. (same word for both blanks)
Because of _____ actual mechanical advantage is always less than ideal mechanical advantage.
The edge of a _____ is an example of a wedge.
A _____ is an example of a third-class lever
_____ are devices that allow you to do work in an easier way.
A _____ can be thought of as an inclined plane wrapped around a cylinder.
A pulley that is attached to a structure is a ______ pulley.
Down
The amount of work is calculated by multiplying force times _____.
A _____ is a device that is thick at one end and tapers to a thin edge at the other end.
_____ equals the amount of work done on an object in a unit of time.
One joule of work done in one second is one _____ of power.
Example of first-calls levers include _____ and scissors.
A machine that combines two or more simple machines is called a _____ machine.
The efficiency of a machine is expressed as a _______.
An inclined plane allows you to exert your input force over a _____ distance.
A ____ is a simple machine made of grooved wheel with a rope or cable wrapped around it.
_____-class levers increase distance, but do not change the direction of the input force.
A _____ pulley is attached directly to the object you are attempting to move.
When you do work, the force you exert is called the ______ force.
You can determine the ideal mechanical advantage of an inclined plane by ______ the length of the incline by its height.
The fixed point that a lever pivots around is called a _____.
Combining fixed and movable pulleys makes a pulley system called a block and _____.
A simple machine made of two connected objects that rotate about a common axis is a wheel and ______.
A ______ plane is a flat, sloped surface.
______-class levers change the direction of the input force.
A _____ is a rigid bar that is free to pivot or rotate, on a fixed point.
The SI unit for work is the newton-meter which is also called a _____.
With a wheel and axle, the object with the larger radius is the _______.
Power is calculated by dividing the amount of work done by the amount of ____ it takes to do the work.