Chapter 14 Test Flashcards
Formula to find work?
Force x Distance
Formula to find power?
Work/Time
How do machines make work easier?
Machines make work easier by changing the force
needed, the direction of the force, or the distance
over which the force acts.
Work _______ is always _____ than the work _______ done on the machine
Output, less, input
Why is the mechanical advantage always less than ideal?
Friction is present in all machines.
Actual mechanical advantage (AMA) =
Output/
Input
Ideal mechanical advantage (IMA) =
Input/
output
Efficiency =
Work output/work input x 100%
Because of friction, the efficiency of any machine
is always
less than 100 percent
The six types of simple machines are
the lever, the
wheel and axle, the inclined plane, the wedge, the
screw, and the pulley.
Power is measured in Si units of
Watt(s)
Power is the rate of doing
work
Work =
force x distance
Power is measured in
Joules
Distance is measured in
meters
