Materials that Float and Sink

Marie Jaja T. Roa Santa Maria West Central School Schools Division of Ilocos Sur

Lesson 1


I have here two different kinds of balls. Which ball do you think will float and which will sink?


Sink means to go below the surface of the water.

Float means to stay above the surface of the water.


Have you ever

wondered why

some object sinks on

water, while some

object floats?


Float

Sink

Descriptive

words for

objects that

float and

objects that

sink.


Rocks in a river.

Ice in a drink.

Some things float.

Some things sink.

Floating things

have buoyancy

Test a little

toy and see

Does it sink?

Does it float?

Could you use it

as a boat?

Try a pencil.

It pop up.

Try a hammer.

Try a cup.


Test some objects

in your bath.

Watch them.

Now you’re

doing Math

If something

is denser than the water

it will sink

But if the water’s

denser, then…

Well,

What do you think?©Amy LV


Well, it’s all

about something

called density.

What causes objects to sink and float?

Density is the degree of

compactness as of an object.


Everything is made of molecules.

Molecules are tiny particles that can be seen with a microscope.


Tightly packed molecules

in an object

Loosely packed

molecules in an object


Objects with tightly packed molecules will sink if it is more dense than the liquid it is immersed in.


Objects with loosely

packed molecules will

float if it’s less dense

than the liquid it is

placed in.


REMEMBER: Materials with a

density less than that of a liquid

float and materials with a greater

density than the liquid sink.


Does the shape of an object affects its ability to float?


Changing the objects shape will also make its ability to float because it holds air and upthrusts has more space to push the object.


Upthrust is the force that pushes an object up and makes it seem to lose weight in a liquid.

It is a push that always goes straight UP, against the direction of gravity.


Upthrust is the force which is responsible in making an object float or sink in a liquid.


Imagine trying to hold this beach ball and this tennis ball, under the water. Which would be easier to hold underwater? Why?


REMEMBER:

Shape affects upthrust. The larger

the surface area of an object, the

stronger the upthrust.


Factors Affecting Sinking or Floating

of Objects

Density or

compactness of

an object

The

material

it is

made of

Weight of

an object

Shape or

form of

an object

Type of

liquid


Float means to stay above the surface of the

water.

Sink means to go below the surface of the water.

Buoyancy is the tendency of an object to float in

liquid.

Density is the degree of compactness of an object.

Upthrust is the force that pushes an object up in a

liquid.


../../Downloads/Science Files/Buoyancy What Makes Something Float or Sink.mp4

../../Downloads/Science Files/Float or Sink Why do things float Why do things sink - Lesso.mp4

../../Downloads/Science Files/Float Why Do Things Float An Easy Lesson.mp4

Materials that Float and Sink

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Transcript of Materials that Float and Sink