Extra Vocab
Work
Mechanical Advantage and Efficiency
Simple Machines
Machines in the Human Body
100
the mechanical advantage a machine provides in a real situation
What is the actual mechanical advantage?
100
What is it called when you exert a force on an object that causes it to move some distance?
What is work?
100
A device with which you can do work in a way that is easier or more effective
What is a machine?
100
a flat, slanted surface
What is an inclined plane?
100
tough connective tissue that attach your muscles to your bones
What are tendons?
200
a simple machine made of two circular or cylindrical objects that are fastened together and that rotate about a common axis
What is a wheel and axle?
200
In order for you to do work on an object, what two things does the object must do?
Move some distance as a result of your force and the force you exert must be in the same direction as the object's motion
200
How does a machine make work easier?
What is changing the amount of force you exert, the distance over which you exert your force, or the direction in which you exert your force?
200
a device that is thick at one edge and tapers to a thin edge at the other end
What is a wedge?
200
Most machines in your body are _________.
What are levers?
300
the ___________ of a machine compares the output work to the input work.
What is efficiency?
300
What's the formula for calculating work?
What is work = force x distance?
300
The force you exert on the machine is called __________.
What is the input force?
300
can be thought of as an inclined plane wrapped around a cylinder
What is a screw?
400
a compound machine with one wheel and axle linked to another wheel and axle
What are gears?
400
SI unit of work
What are joules?
400
The force exerted by the machine is called _________.
What is the output force?
400
a rigid bar that is free to pivot, or rotate, about a fixed point
What is a lever?
400
Your arm works as which class lever?
What is a third class lever?
500
the more efficient a machine is, the closer the actual mechanical advantage is to the____________.
What is the ideal mechanical advantage?
500
To help rearrange the furniture in your classroom, you exert a force of 20 N to push a desk 10 m. How much work do you do?
What is 200 J?
500
The number of times a force exerted on a machine is multiplied by the machine
What is the mechanical advantage?
500
a grooved wheel with a rope wrapped around it
What is a pulley?
500
The ball of your foot is the fulcrum of which type of lever?
What is a second class lever?
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