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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
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
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?
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
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 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
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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