force and distance
The amount of work done on an object is obtained by multiplying
changing the direction of your force.
One way a machine can make work easier for you is by (flag pole)
nutcracker, scissors, knife
The output force is greater than the input force for a
seasaw, wheelbarril, bottle opener
What is an example of a second-class lever?
bicycle, pencil sharpener, door knob
Give an example of a complex machine?
no work is done.
If none of the force on an object is in the direction of the object's motion,
What reduces the efficiency of a machine?
What is the comparison between output work and input work?
What type of machine is an inclined plane wrapped around a central cylinder?
What type of machine are your front teeth?
What is the unit of work?
What is the efficiency of an ideal machine?
Efficiency = Output work divided by input work
What is the formula for efficiency?
changing the direction.
A machine can make work easier by
An ax, a zipper, and a front tooth are examples of what type of simple machine?
ideal mechanical advantage of wheel and axle
What are you finding when you divide the radius of a wheel by the radius of an axle?
What is a compound machine with one wheel and axle linked to another wheel and axle?
The fixed point that a lever rotates around
combinatons of simple machines
Compound machines are
When you bend your arm at the elbow, the fulcrum is at your
move some distance
In order to do work you must
the number of times a force exerted on a machine is multiplied by the machine.
In a screwdriver, the handle is the wheel and the shaft is the
Muscles are attached to bones by
ideal mechanical advantage
The more efficient the machine is, the closer the actual mechanical advantage is to the
does not decrease
a machine ______ the amount of work you do.
An inclined plane wrapped around a cyliner is a
What simple machine is a rope wrapped around a grooved wheel?
A singe fixed pulley, such as a flagpole, changes the
When you bite into a sandwich, your front teeth act as