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# Chapter 17.3 - PowerPoint PPT Presentation

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

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

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

• 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

Why do objects sink and float? displaced was 0.45 N

• 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? displaced was 0.45 N

• 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.

• 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 a boat, approx. 10 cubic meters.

Charles’ law a boat, approx. 10 cubic meters.

• 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. a boat, approx. 10 cubic meters.

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

Gases and pressure a boat, approx. 10 cubic meters.

What is atmospheric pressure? a boat, approx. 10 cubic meters.

• 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 states a boat, approx. 10 cubic meters.

• 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 a boat, approx. 10 cubic meters.

• P1 = initial pressure V1 = initial volume

• P2 = new pressure V2 = new volume

• P1 V1 = P2 V2

Example a boat, approx. 10 cubic meters.

• 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: a boat, approx. 10 cubic meters.

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

Viscosity of Fluids a boat, approx. 10 cubic meters.

Viscosity: a boat, approx. 10 cubic meters.

• 1. Measure of a materials resistance to flow.

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

Temperature and Viscosity a boat, approx. 10 cubic meters.

• As a liquid gets warmer its viscosity decreases.

• As a gas gets warmer its viscosity increases.

HOMEWORK: a boat, approx. 10 cubic meters.

• P. 307 Problems 1-3

• Honors 1-5