Pressure is force per unit area. The force of a
book on a table is also pressure on the table. The formula for
pressure is:

The pressure being exerted by the book on the table will
be the pounds per square inch. We will divide the pounds of force
from the book by the number of square inches covered by the book. A
square inch is an area 1 inch by 1 inch.

Let's say the book weights 2 pounds. The area
covered on the table by the book is 4 inches by 6 inches. The
squares inches would be 4 X 6 = 24 sq. in.

Pressure
=

2 lb

------------

24 sq in

The pressure of the book on the table is:

2

1

of a pound per square inch

----

or

----

24

12

Complete the questions below.

Pressure is
per unit area.

The formula for pressure is force divided by
.

Area is the number of
inches.

A square inch is an area
inch by
inch.

An object that measures 8 inches by 10 inches will have
an area of
square inches.

If an object weighs 4 pounds and covers an area of 20
square inches, its pressure will be
fifth of a pound per square inch.

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