5.3: Floating and Sinking

What are the two forces needed for an object to float or sink?

• air resistance and tension forces

• gravitational and upthrust forces

• friction and drag forces

• normal and applied force

Tags

NGSS.MS-PS2-4

An object will ​ (a)   if the mass of an object is less than, or ​ (b)   to, the mass of water displaced by ​ (c)   . An object will ​ (d)   if the mass of the object is greater than the mass of the water ​ (e)   by water.

• float
• equal
• upthrust
• sink
• displaced
• less

How did the Titanic float?

• The Titanic was very light.

• The Titanic had a lot of air inside.

• The Titanic was made of special material.

• The Titanic displaced a mass bigger than the ship’s mass.

How did the Titanic sink?

• The Titanic was not well-built.

• The Titanic was too heavy.

• The Titanic was too old.

• The weight due to gravity of the Titanic was greater than the upthrust of water.

What force is responsible for pushing an object up in water or air?

• upthrust

• friction

• gravity

• magnetism

Which ball will sink?

• A

• B

• C

• D

What is DISPLACEMENT?

• the amount of space an object occupies

• the action of one object or surface moving against another

• the moving aside of water as a result of upthrust

• the speed of an object in motion

A man's weight is 400 N. What upthrust does he need to FLOAT?

• 500 N

• 600 N

• 400 N

• 1 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Weight is the measure of ________

• gravity on an object.

• a push or a pull on an object.

• the mass of an object.

• the momentum of an object.

Tags

NGSS.MS-PS2-4

Draw a force diagram of a FLOATING ball. Don't forget to label the forces involved.