Chapter 17 3
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Chapter 17.3. How do buoyancy and Archimedes’ principle relate to fluids?. Buoyancy. measure of the upward pressure a fluid exerts on an object. What is Archimedes’ principle?. the force exerted on an object in a liquid is equal to the weight of the fluid displaced by the object. Example.

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Chapter 17.3

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Chapter 17 3

Chapter 17.3

  • How do buoyancy and Archimedes’ principle relate to fluids?


Buoyancy

Buoyancy

  • measure of the upward pressure a fluid exerts on an object.


What is archimedes principle

What is Archimedes’ principle?

  • the force exerted on an object in a liquid is equal to the weight of the fluid displaced by the object.


Example

Example

  • If a rock weighs 2.25 N using a spring scale is placed in water

  • the scale will then register 1.8 N

  • the water experts a force of 0.45 N


According to archimedes principle the weight of the water displaced was 0 45 n

According to Archimedes’ principle the weight of the water displaced was 0.45 N


Different fluids all have different buoyancy

Different fluids all have different buoyancy


Why do objects sink and float

Why do objects sink and float?

  • If the buoyancy factor is greater than the weight of the object, the object floats.

  • If the buoyancy factor is less than the weight of the object, the object sinks.


Why does a block of steel sink but a steel boat float

Why does a block of steel sink, but a steel boat float?

  • 1 cubic meter of water = 9,800 N

  • 1 cubic meter of steel = 76,400 N

  • What happens?


The block of steel is flattened and hollowed inside to make a boat approx 10 cubic meters

The block of steel is flattened and hollowed inside to make a boat, approx. 10 cubic meters.

  • How much water is displaced?

  • 10 cubic meters of water = 98,000 N

  • 1 cubic meter of steel = 76,400 N

  • What happens?


Buoyancy and gases

Buoyancy and gases


Charles law

Charles’ law

  • The volume of a gas increases with increasing temperature.

  • The volume of a gas decreases with decreasing temperature.


How does charles law explain how a hot air balloon works

How does Charles’ Law explain how a hot air balloon works.

  • As the air inside is heated it will become less dense than that the air outside the balloon


Gases and pressure

Gases and pressure


What is atmospheric pressure

What is atmospheric pressure?

  • the force required to hold the air around the earth

  • At the Earth’s surface the atmospheric pressure is 101,300 pascals or newtons.


Boyle s law explains how pressure and volume are related

Boyle’s law explains how pressure and volume are related.


Boyle s law states

Boyle’s Law states

  • 1. as the pressure of gas increases, its volume decreases proportionately.

  • 2. as the pressure of gas decreases, its volume increases proportionately.


Formula for boyle s law

Formula for Boyle’s law

  • P1 = initial pressure V1 = initial volume

  • P2 = new pressure V2 = new volume

  • P1 V1 = P2 V2


Example1

Example

  • Suppose 5 L of air at atmospheric pressure(101.3 Kilopascals) is compressed in a 0.5 L aerosol can. What is the pressure of the compressed air in the can?

  • Work the problem


Homework

HOMEWORK:

  • Compare and contrast Charles’s law and Boyle’s Law


Viscosity of fluids

Viscosity of Fluids


Viscosity

Viscosity:

  • 1. Measure of a materials resistance to flow.

  • 2. Determined by the siae and shape of the molecules


Temperature and viscosity

Temperature and Viscosity

  • As a liquid gets warmer its viscosity decreases.

  • As a gas gets warmer its viscosity increases.


Homework1

HOMEWORK:

  • P. 307 Problems 1-3

  • Honors 1-5


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