Screw
what are the screw mechanical advantage?
The smaller the distance between its threads, the larger the mechanical advantage, and the larger the force the screw can exert for a given applied force.
The object being lifted is the __________.
load
Another name for an inclined plane is a ____________.
ramp
Here at school, you could see a pulley on a ______________.
flagpole?
The wheel and axle is made up of two parts: the wheel that turns on a post, which is called the __________.
axle?
What screw do?
Machines that use screws to push against other objects are called presses. A press is used to make cider or wine by squashing fruit to extract the juice from it.
The push or pull that turns a lever is the ____________.
force
If you use an inclined plane, the distance is longer, but it takes less _______________.
effort
The pulley uses a ____________ and rope to lift a load.
wheel
You create a screw when you wrap on inclined plane into a _______________ around a pole.
spiral?
How screw make work easy?
Screws with threads closer together require less force to turn because the length of the inclined plane is longer.
A lever is a board or bar that moves on a _______________.
fulcrum
An inclined plane is a simple machine that is a flat surface that is ___________ at one end.
higher
Two inclined planes placed back to back make this simple machine.
wedge
Using a screw takes ______________ force than pounding a nail.
less?
What screw provide?
Screws provide more strength and holding power
The point where the lever turns is the _____________.
fulcrum
The inclined plane is a simple machine that is a ___________________ that is higher at one end.
flat surface
In a wedge, force is used to raise an object or _____________ the objects apart.
split
In a wheel and axle, the wheel makes a large circular movement, and the axle makes a ____________ movement.
smaller?
Who create the screw?
Archytas of Tarentum
A lever can let you change direction of a force or it can change the amount of ______________ needed.
force
Scientists think inclined planes may have been used to build the _______________ because the blocks were too heavy to move straight up.
pyramids
A _________________ pulley makes work easier than a one-wheel pulley.
two-wheel?
Just like an inclined plane, a screw moves a longer distance, but less ____________ is needed.
effort