Work
What is the equation for work?
W = F x D
Equation for power?
Power = work/time
Define energy.
The ability to do work.
The wheel of a pulley is called a ______?
Sheave
A bottle opener is this class of lever.
1st or 2nd
Work units?
joules
Units for power?
Watts
Unit for energy?
joules
Equation for mechanical advantage for any machine?
Force output/force input
What are the parts of a lever?
effort, fulcrum, load
Calculate work.
Force: 12 N
Distance: 20 m
240 J
Calculate power.
Force: 300 N
Distance: 40 m
time: 20 s
600 watts
Total energy has to consider these 2 types of energy.
Kinetic & potential
Equation for mechanical efficiency for any machine?
Work output/work input (* 100%)
Is the effort force the same as the input or output force?
Input
Calculate force.
Work: 800 J
Force: ?
Distance: 22 m
36.4 N
Calculate power.
Force: 7500 N
Distance: 330 m
time: 55 s
45,000 watts
Name 4 different types of energy.
thermal, chemical, nuclear, electrical, electromagnetic
The mechanical advantage of a pulley is? (for a pulley only)
Equal to the number of load supporting ropes.
Kinetic energy varies with? (what does the equation for kinetic energy consider?)
mass & velocity
Calculate distance.
Work: 1,750,000 J
Force: 2000 N
Distance: ?
875 m
How long did it take?
Power: 24,000 watts
Work: 320,000 N
time: ?
13.3 s
Gravitational potential energy uses what in its equation that kinetic energy does not use?
Height
The 6 simple machines.
Inclined plane (ramp), lever, pulley, screw, wedge, & wheel & axle
The # of times a machine multiplies force is called ______.
mechanical advantage