Change in WeightLesson 11

In our last lesson we learned about the water cycle.

Evaporation

Condensation

Precipitation

Run off

Today we are going learn about how mass and weight are related.

How are mass and weight related?

Mass and weight are related but they are not the same. They are

two measures for an object.

Mass is a physical characteristic of matter. Mass is the amount of matter in an object. Different

objects have different amounts of mass.

What is matter?

Weight is another physical property. Weight and mass are not the same thing. Weight is how hard gravity is

pulling on an object.

While the mass of an object can stay constant depending where you measure it, it’s weight can

change.

Weight is the pull of gravity on an object. The closer an object is to

the center of gravity the more it is going to weigh.

Gravity is dependent on the size of an object. The bigger the object

the greater the gravitational pull.

The weight of a person on Earth is much greater than the same

person on the moon because the gravitational pull on the moon is

much less.

We weigh only 1/6th of our weight on the moon because the Moon is

1/6th of the Earth’s size.

Even though the persons weight changes, the mass stays the same. Mass is not affected by gravitational pull.

Mass will not change unless you add more mass to an object or

take more mass away.

Mass will remain the same whether we are on the moon, the Earth or

anywhere.

The confusing thing is that when people talk about how much they

weigh, they really are saying how

much mass they have.

When someone says they have gained weight, they technically have gained mass. Mass of a

person changes depending on what they eat or how much

exercise they get.

Weight will change when the gravitational pull changes.

Mass is measured in Grams and Kilograms.

We measure weight by Newtons.

https://www.youtube.com/watch?v=-F5nmIJOF4U

Let’s watch this video about mass and weight.

Let’s listen to this song about mass and weight.

https://www.youtube.com/watchv=1whMAIGNq7E&list=TL69zKYJui3JA song

In our next lesson we will see how matter can be changed into

different properties.

We will also learn to describe the different changes that take place

in matter.

Good Job Today!

And remember to….

See you next time!