14.1 Work and Power
The SI unit of work is the __?
The Joule
A machine is a device that changes a ___?
Direction or magnitude
The IMA equals the ratio of the input distance to the output ___?
Output distance
What are the six types of simple machines?
Lever, Wheel and Axle, Inclined Plane, Wedge, Screw, and Pulley
What is a joule equal to?
1 Newton-meter
The SI unit of power is the ___?
The Watt
The force that is exerted on a machine is called the ____ force.
Input force
Because of friction is always present, the AMA is always ____ than the IMA.
Less than
Two or more simple machines working together make up a ____?
Compound Machine
1hp = how many watts
746 watts
The watt and the horsepower are both units of ___?
Power
The work input equals the input force multiplied by the input ___.
Input distance
The ____ of a machine is the number of times that the machine increases the input force.
The mechanical advantage (MA)
The IMA of a third-class lever is always greater than, equal to, or less than?
Less than
Any part of a force that does not act in the direction of an object's motion does no ___ on an object?
No work
The rate at which work is done is called __?
Power
A ____ changes the size of a force needed, the direction of a force, or the distance over which a force acts.
Machine
The AMA equals the ratio of the output ___ to the input force.
Output force
Screws with threads that are closer together have a ___ IMA?
Have a greater IMA
You calculate work by multiplying the force acting in the direction of ___ by the distance the object moves.
The force
For work to be done on an object, the object has to ____?
Move in the direction of that force
The distance the output force is exerted through is the ___ distance.
Output distance
The IMA of a machine is the mechanical advantage in the absence of ___?
Friction
The IMA of a pulley system is equal to the number of rope sections supporting the load being lifted. True or False?
True
A ____ can be described as an inclined plane wrapped around a cylinder?
A screw