Formulas
Force x Distance
What is the formula for work.
What is power?
What does a machine change when the mechanical advantage is 1.
What is direction?
Find the Mechanical Advantage
Output Force = 850 N
Input Force = 25 N
What is 34?
Meter
Formula for Mechanical Advantage
Output Force
---------------
Input Force
Do you do any work in walking with a bag on your back down a hallway? Tell me why
Because the force acting on the object is not being done in the same direction in which the bag is moving.
What does a machine change when the mechanical advantage is more than 1.
What is force?
Convert 435,000 Watts to Kilowatts
What is 435 kW?
Newton
What is the unit for force?
Watts
-------
1000
What is the formula to convert Watts to Kilowatts?
What does a machine change?
Either the force exerted, direction the force is applied, or the distance over which the force is exerted.
What does a machine change when the mechanical advantage is less than 1?
What is Distance?
Find the work done by Gabriel
Force exerted is 42N
Distance over which force is exerted is 5.5m.
What is 231 J?
Unit for Work
What is the Joule?
Formula for Efficiency
Output Work
--------------- x 100%
Input Work
What is the difference between a real and ideal machine?
An ideal machine's efficiency is 100%
A real machine's efficiency is always less than 100%
Why is the output work of a machine always less than the input work?
Friction
What is the power of this machine?
Force: 635 N
Distance: 2 m
Time: 2 seconds
What is 635 Watts
Unit for Power
What is watts?
Force x Distance
--------------------
Time
What is the formula for power?
The 3 conditions for work to be accomplished
Force is applied
Movement
Movement in the direction of the force applied
What is the number of times a machine increases a force exerts on it?
Mechanical Advantage
Find the efficiency of this machine:
Input work: 450 N
Output Work: 90 N
What is 20%?
Units for a object with very large amounts of power.
What is the kilowatt?