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Questions and Answers
Questions and Answers
What does Chapter 13 refer to?
What does Chapter 13 refer to?
Chapter 13
A resting object exerts pressure equal to what?
A resting object exerts pressure equal to what?
its weight divided by its contact area
Compared to the pressure exerted by a brick standing on its end, the pressure exerted by a brick resting on its side is?
Compared to the pressure exerted by a brick standing on its end, the pressure exerted by a brick resting on its side is?
less
The amount of water pressure you experience while swimming in a pool depends on?
The amount of water pressure you experience while swimming in a pool depends on?
What happens to air pressure as the altitude increases?
What happens to air pressure as the altitude increases?
What did Pascal discover about changes in pressure?
What did Pascal discover about changes in pressure?
Which of the following is not true about Bernoulli's principle?
Which of the following is not true about Bernoulli's principle?
The buoyant force acting on a submerged object is equal to?
The buoyant force acting on a submerged object is equal to?
A partially submerged object floats when?
A partially submerged object floats when?
A submarine changes depth by altering its?
A submarine changes depth by altering its?
Explain why you don't feel the more than 1000 Newtons of force exerted by the atmosphere on your head.
Explain why you don't feel the more than 1000 Newtons of force exerted by the atmosphere on your head.
Explain how lift works with an airplane.
Explain how lift works with an airplane.
What is lift?
What is lift?
What is a fluid?
What is a fluid?
What is Pascal in terms of pressure?
What is Pascal in terms of pressure?
What is pressure?
What is pressure?
What is buoyancy?
What is buoyancy?
What is buoyant force?
What is buoyant force?
What is a hydraulic system?
What is a hydraulic system?
What is Archimedes' principle?
What is Archimedes' principle?
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Study Notes
Study Notes
Pressure and Forces
- An object at rest exerts pressure determined by its weight divided by the contact area.
- A brick standing on its end exerts more pressure compared to when it's resting on its side due to a smaller contact area.
- Water pressure experienced while swimming increases with depth.
Air Pressure and Altitude
- Air pressure decreases as altitude increases; this is significant for various weather patterns and aviation.
Pascal's Principle
- Pascal established that pressure changes are transmitted uniformly throughout a fluid, which is foundational in fluid mechanics.
Bernoulli’s Principle
- Contrary to common belief, the pressure in a moving fluid is lower than in a non-moving fluid, which underpins aerodynamic lift.
Buoyant Force
- The buoyant force on a submerged object is equal to the weight of the fluid it displaces.
- A partially submerged object will float when its weight matches the buoyant force.
Submarine Operations
- Submarines adjust their depth by changing density, allowing them to rise or sink in water.
Atmospheric Pressure
- Despite the atmosphere exerting substantial force (over 1000 Newtons), the pressure inside the body opposes it, leading to a balance that is why external pressure isn’t felt.
Lift and Flight Mechanics
- Airplane lift occurs because the air pressure above the wing is lower (due to faster airspeed) than below, creating an upward force that counteracts gravity.
Key Definitions
- Lift: An upward force driven by pressure differences.
- Fluid: A substance that can flow without a fixed shape.
- Pascal: The standard SI unit of pressure.
- Pressure: Force applied per unit area.
- Buoyancy: A fluid’s capacity to exert an upward force on immersed objects.
- Buoyant Force: An upward force acting on an object submerged in a fluid.
- Hydraulic System: A system using pressurized fluid to amplify force using pistons of different sizes.
- Archimedes' Principle: States that the buoyant force is equivalent to the weight of the fluid displaced by an object.
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