Upthrust and atmospheric pressure

Question 1

What do objects in fluids experience

Answer 1

Upthrust

Question 2

What happens when an object is submerged in a fluid

The … of the fluid … a … on it from every …

Answer 2

The pressure of the fluid exerts a force on it from every direction

Question 3

The force entered on the bottom of the object is … than the force acting on the top of the object

Answer 3

Larger

Question 4

The Upthrust is equal to the …

Answer 4

Weight of the fluid that has been displaced by the object

Question 5

What happens when the Upthrust on an object is equal to the objects weight

Answer 5

The forces balance and the object floats

Question 6

When does an object float

Answer 6

When the Upthrust on an object is equal to the objects weight

Question 7

When does an object sink

Answer 7

When the objects weight is more than the Upthrust

Question 8

What happens to an object when the weight is more than the Upthrust

Answer 8

It’s sinks

Question 9

What is Upthrust

-… increases with …
-so the force … on the … of the object is … the force on … of the …
-this causes a … force …
-know as …

Answer 9

-pressure increases with depth
-so the force exerted on the bottom of the object is larger the force on top of the object
-this causes a resultant force upwards
-know as Upthrust

Question 10

How does an object float

-when the … is less … than the …
-it will also … less that the … same … of … as the object
-so it … a volume of liquid that is … to its … before it’s …
-causing it to …

Answer 10

-when the object is less dense than the liquid
-it will also weigh less that the exact same volume of fluid as the object
-so it displaces a volume of liquid that is equal to its weight before it’s submerged
-causing it to float

Question 11

How do submarines work

-To … large … are filled with … to increase the … so that it is … than the …
-to … the tanks are filled with … air to reduce its … do that it’s … than the …

Answer 11

-To sink large tanks are filled with water to increase the weight so that it is more than the Upthrust
-to rise the tanks are filled with compressed air to reduce it weight do that it’s less than the Upthrust

Question 12

Why does atmospheric pressure decrease with height

-as the … increases the … becomes less … so there are … air … able to … with the surface
-there are also … air … above a … so there is less … above it

Answer 12

-as the altitude increases the atmosphere becomes less dense so there are fewer air molecules able to collide with the surface
-there are also fewer air molecules above a surface so there is less weight above it