Work and power
this must happen for work to be done
Work is done when a force causes and object to move in the direction of the force
this tells how much a machine increases force
mechanical advantage
a ramp is this type of machine
inclined plane
the pivot point of a lever
fulcrum
work is done if an object does not move
false - does move
wedges and screws are actually this type of machine
inclined planes
formula for work
IMA for an inclined plane = length/_______
height
a knife is this type of machine
wedge
this class of lever has the load in the middle
2nd class
output force is the force a machine produces
true
MA of lever (3) + pulley (2) equals this total of MA
6
units used to measure power
watts
this reduces efficiency in machines
friction
a screwdriver is this type of machine
wheel and axel
fishing pole is this class of lever
3rd class
a wheel and axel is a compound machine
false - simple
carrying bricks across a room is this type of work
no work
power = ________ / time
work
if MA = 3, the force is multiplies by this number
3
this machine uses a rope and wheel
what is a pulley
this class has fulcrum in the middle
1st class
power is measure in joules
false - watts
machines are not 100% efficient because of this
friction
if you push with 10 N for 5 m, how much work was done?
50 joules
if IMA = 6 and efficiency is less than 100%, AMA is.....
less than 6
a bicycle is this type of machine
compound machine
hands farther apart on the handlebars making steering easier because of this
greater torque (rotation)
lifting an object is doing work
true
AMA compared to IMA is always
AMA is always less than IMA