Podcast
Questions and Answers
What does a specific gravity (SG) of 0.72 for gasoline indicate?
What does a specific gravity (SG) of 0.72 for gasoline indicate?
Which factor does NOT affect the specific gravity of aviation fuel?
Which factor does NOT affect the specific gravity of aviation fuel?
According to Archimedes’ Principle, what happens to an object submerged in a fluid?
According to Archimedes’ Principle, what happens to an object submerged in a fluid?
What must an object do to float according to the principle of buoyancy?
What must an object do to float according to the principle of buoyancy?
Signup and view all the answers
What is the relationship between density and floating behavior of materials?
What is the relationship between density and floating behavior of materials?
Signup and view all the answers
Which statement accurately describes the role of force in changing a body's state of motion?
Which statement accurately describes the role of force in changing a body's state of motion?
Signup and view all the answers
What is necessary for a vector quantity to be defined completely?
What is necessary for a vector quantity to be defined completely?
Signup and view all the answers
Which of the following processes is NOT a way that force can interact with mass?
Which of the following processes is NOT a way that force can interact with mass?
Signup and view all the answers
When adding vectors, what is the correct method to ensure an accurate resultant vector?
When adding vectors, what is the correct method to ensure an accurate resultant vector?
Signup and view all the answers
Which statement best differentiates between scalar and vector quantities?
Which statement best differentiates between scalar and vector quantities?
Signup and view all the answers
What condition must be satisfied for an object to be in a state of equilibrium?
What condition must be satisfied for an object to be in a state of equilibrium?
Signup and view all the answers
How is the moment defined for both load and effort in a lever?
How is the moment defined for both load and effort in a lever?
Signup and view all the answers
What is a necessary characteristic of a simple machine, such as a lever?
What is a necessary characteristic of a simple machine, such as a lever?
Signup and view all the answers
In the scenario of a car being equally pushed from both ends, what happens to the resultant force?
In the scenario of a car being equally pushed from both ends, what happens to the resultant force?
Signup and view all the answers
What is the primary purpose of resolving a vector into its components?
What is the primary purpose of resolving a vector into its components?
Signup and view all the answers
What will occur if the load moment exceeds the effort moment in a lever system?
What will occur if the load moment exceeds the effort moment in a lever system?
Signup and view all the answers
Which of the following best describes the function of the tension force in the chain?
Which of the following best describes the function of the tension force in the chain?
Signup and view all the answers
In a scenario where multiple forces act on a body at various angles, how is the resultant force calculated?
In a scenario where multiple forces act on a body at various angles, how is the resultant force calculated?
Signup and view all the answers
What role does the fulcrum play in the moment balance of a lever?
What role does the fulcrum play in the moment balance of a lever?
Signup and view all the answers
What happens when the resultant of all forces acting on an object is not zero?
What happens when the resultant of all forces acting on an object is not zero?
Signup and view all the answers
Study Notes
Density and Specific Gravity
- Specific gravity measures the weight of a substance compared to the weight of an equal volume of water.
- Gasoline has a specific gravity of 0.72, meaning it weighs 72% of the same volume of water.
- Objects with lower density float on objects with higher density.
- The specific gravity of aviation fuel varies due to refining processes, storage facilities, and ambient conditions.
Refuelling
- The specific gravity of aviation fuel is used to calculate the volume of fuel needed to achieve the requested weight.
- The formula is: Weight of fuel (kg) = Volume (litres) x Specific Gravity
Archimedes’ Principle
- An object submerged in a fluid displaces a volume of fluid equal to its own volume.
- The pressure at the bottom of a submerged object is greater than at the top, creating an upward force called upthrust.
- The upthrust force is equal to the weight of the fluid displaced.
- If the upthrust force is greater than the object’s weight, the object will float.
Forces, Moments, and Couples
- A force can change a body’s state of motion. Forces can start, stop, accelerate, or decelerate a mass.
- Vectors describe quantities with both magnitude and direction.
- To add vectors, move one vector’s tail to the other’s head.
- Moments involve a force acting at a distance from a pivot point, called the fulcrum.
- The moment’s magnitude is calculated by multiplying the force by the distance from the fulcrum (moment arm).
- A lever is an example of a simple machine with a mechanical advantage (MA).
- MA refers to the ratio of the output force to the input force.
- Velocity ratio (VR) is the ratio of the input speed to the output speed.
- A couple is a twisting force produced by two equal and opposite forces acting parallel to each other on a body with a rotational axis.
Centre of Gravity
- Center of Gravity (CG) is the point where the weight of a body is concentrated.
- The CG of a uniform object is located at its geometric center.
- Irregularly shaped objects can have their CG determined by finding the intersection of verticals from two different suspension points.
- An object freely suspended from one point will hang with its CG in the vertical line passing through the suspension point.
- Shifting passengers, baggage, or fuel can change an aircraft’s CG.
- Aircraft manufacturers define a safe range for CG position to ensure control and stability.
Rotating Objects
- A perfectly balanced disc or wheel will have its CG coinciding with its axis of rotation.
- Uneven dimensions, wear, or damage can cause the CG of an object to shift, creating imbalances.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your understanding of density, specific gravity, and Archimedes' principle with this quiz. Explore how these concepts apply to substances like gasoline and aviation fuel. Determine how specific gravity impacts refueling calculations and buoyancy.
