Work & Power
Work= Force x Distance
746 Watts = ______ Horsepower
1
Machines make work easier to do. They change the size of the ____________ needed, the direction of a force, or the distance over which a force acts.
Force
True or False: Mechanical Advantage is the number of times that the machine increases an input force.
True
An ax is an example of this type of simple machine...
Wedge
No
The work going INTO a machine is called...
Work input
Because of __________, the work done by a machine is always less than the work done on the machine.
Friction
Because friction is always present, the AMA of a machine is always _______________ than the IMA.
Less
You will have used a ___________, by opening our classroom door.
Lever
How is work measured?
Joules
The work being produced from a machine is called...
Work Output
List the six types of simple machines.
Lever, Pulley, Wheel and Axel, Inclined Plane, Screw Wedge
The IMA does or does not include the presence of friction?
Does not
* Absence of friction
A _________________ is an inclined plane wrapped around a cylinder.
Screw
How is power measured?
Watts
Doing work at a faster rate requires more _________.
Power
What is a compound machine?
More than one simple machine added together to perform a function.
100
A _____________ consists of a rope that fits into a groove in a wheel.
Pulley
What is the formula for power?
Power= work/ time
The most commonly used source of power in the 1700's was...?
Horsepower
A bicycle is a compound machine. Name at least two simple machines that make up this compound machine.
Pulley, Wheel and Axel...
What is the formula for Efficiency?
Work output/ work input x 100%
A steering wheel is considered this type of simple machine.
Wheel and Axel