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Simple Machines and Work Study Guide
Terms in this set (30)
For work to be done on an object,
the object must move some distance as a result of a force.
If you exert a force of 20 newtons to push a desk 10 meters, how much work do you do on the desk?
Work is measured in
What do machines do?
change the amount of force you exert or the distance over which you exert the force
Pulling down on a rope to hoist a sail on a sailboat is an example of a machine
changing the direction over which a force is exerted
The mechanical advantage of a machine is the number of times a machine increases
the force exerted on the machine
Without friction there would be
equal input and output work
An ideal machine would have an efficiency of
A ramp is an example of a simple machine called an
The ideal mechanical advantage for an inclined plane is equal to the length of the incline divided by the
height of the incline
Which of these is an example of a third-class lever?
Which of these is an example of work being done on an object?
holding a heavy piece of wood at a construction site;
trying to push a car that doesn't move out of deep snow;
pushing a child on a swing;
holding a door shut on a windy day so it doesn't blow open
pushing a child on a swing
The ideal mechanical advantage of a wheel and axle is equal to the
radius of the wheel divided by the radius of the axle
A machine that utilizes two or more simple machines is called a
One example of a compound machine is a
Which body parts act as the fulcrums of levers?
Which body parts are shaped like wedges?
muscles/tendons/incisors/bones in your legs
A simple machine that might be thought of as an inclined plane that moves is a
Which of these could be considered an inclined plane wrapped around a cylinder?
lever/screw/wheel and axle/pulley
The fixed point that a lever pivots around is called the
In order to do work on an object, the force you exert must be
in the same direction as the object;s motion
Work equals force times
When you raise or lower a flag on a flagpole, you are using
How can a hockey stick be considered a machine?
it multiplies distance
The mechanical advantage of a machine that changes only the direction of force is
Most of the machines in your body consist of bones and muscles and are called
If tight scissors have an efficiency of 50%, half of your work is wasted due to
The power of a light bulb that converts electrical energy at a rate of 100 joules per second is
Power is measured in units called
The wedge, screw, and lever are all
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