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Vocabulary
Read the vocabulary terms to understand the reading better.
Drill Bit
A drill bit is a working end of a drill tool that can be changed to different sizes.
Screw
A screw is an inclined plane twisted around a rod that can join, cut, lift, or push. A jar lid is an example of a screw.
Simple Machines
Simple machines make work easier and have few or no moving parts.
Inclined Plane
An inclined plane can help move heavy objects. A ramp is an example of an inclined plane.
Jack
A jack is a simple machine that uses a large screw to easily lift a car to change its tire.
Screws
A screw is an inclined plane twisted around a rod. Screws can join, cut, lift, or push. Screws make work easier. They are simple machines.
Where Screws Are Used
Builders attach wood with screws.
Jars have lids that screw on.
The screw shape holds the lid tight on the jar.
A jack lifts a car so you can change a tire.
The jack uses a large screw.
A twirling piano stool uses a screw.
The seat twirls up and down.
Drill bits are shaped like screws
to make holes in materials such as wood.
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