Podcast
Questions and Answers
In two-dimensional motion analysis, which type of coordinate system is characterized by radial distance and angle?
In two-dimensional motion analysis, which type of coordinate system is characterized by radial distance and angle?
- Tangential coordinates
- Polar coordinates (correct)
- Central paths
- Cartesian coordinates
Which of the following coordinate systems involves describing the motion of a particle along a curved path using coordinates that are tangent and normal to the path?
Which of the following coordinate systems involves describing the motion of a particle along a curved path using coordinates that are tangent and normal to the path?
- Polar coordinates
- Cartesian coordinates
- Central paths
- Tangential coordinates (correct)
If the acceleration of a particle is given as a function of time, what mathematical operation is used to determine the velocity of the particle?
If the acceleration of a particle is given as a function of time, what mathematical operation is used to determine the velocity of the particle?
- Differentiation
- Vector cross product
- Integration (correct)
- Laplace transform
Given a particle moving in a plane with acceleration (\vec{f} = 3t \hat{i} + 2 \hat{j}), which expression represents its velocity (\vec{v}) if the initial velocity at $t=0$ is (\vec{v_0} = 3\hat{i} - 2\hat{j})?
Given a particle moving in a plane with acceleration (\vec{f} = 3t \hat{i} + 2 \hat{j}), which expression represents its velocity (\vec{v}) if the initial velocity at $t=0$ is (\vec{v_0} = 3\hat{i} - 2\hat{j})?
A particle's motion is described in Cartesian coordinates with its position vector given by (\vec{r} = x\hat{i} + y\hat{j}). If (\hat{i}) and (\hat{j}) are unit vectors along the x and y axes, respectively, what do 'x' and 'y' represent?
A particle's motion is described in Cartesian coordinates with its position vector given by (\vec{r} = x\hat{i} + y\hat{j}). If (\hat{i}) and (\hat{j}) are unit vectors along the x and y axes, respectively, what do 'x' and 'y' represent?
Given the velocity components of a particle as functions of time, what mathematical operation determines the displacement of the particle?
Given the velocity components of a particle as functions of time, what mathematical operation determines the displacement of the particle?
A particle starts from position ((3, -2)) with an initial velocity of (3\hat{i} - 2\hat{j}) and is subjected to a constant acceleration of (3\hat{i} + 2\hat{j}). What is the position vector (\vec{r}) of the particle at time (t)?
A particle starts from position ((3, -2)) with an initial velocity of (3\hat{i} - 2\hat{j}) and is subjected to a constant acceleration of (3\hat{i} + 2\hat{j}). What is the position vector (\vec{r}) of the particle at time (t)?
What are the unit vectors in the directions of increasing (r) and (\theta) in a polar coordinate system?
What are the unit vectors in the directions of increasing (r) and (\theta) in a polar coordinate system?
Given (\hat{r} = \cos \theta \hat{i} + \sin \theta \hat{j}) and (\hat{\theta} = -\sin \theta \hat{i} + \cos \theta \hat{j}), what is the time derivative of (\hat{r}), denoted as (\dot{\hat{r}})?
Given (\hat{r} = \cos \theta \hat{i} + \sin \theta \hat{j}) and (\hat{\theta} = -\sin \theta \hat{i} + \cos \theta \hat{j}), what is the time derivative of (\hat{r}), denoted as (\dot{\hat{r}})?
In polar coordinates, if the position vector is given by (\vec{r} = r \hat{r}), what is the expression for the velocity vector (\vec{v})?
In polar coordinates, if the position vector is given by (\vec{r} = r \hat{r}), what is the expression for the velocity vector (\vec{v})?
What are the radial and transverse components of acceleration in polar coordinates?
What are the radial and transverse components of acceleration in polar coordinates?
In central force motion, what quantity is conserved?
In central force motion, what quantity is conserved?
If a particle moves in a plane such that its speed components are constant, and one component is along a fixed line OX, while the other is perpendicular to OP (where O is the origin and P is the particle's position), what can be said about the force acting on the particle?
If a particle moves in a plane such that its speed components are constant, and one component is along a fixed line OX, while the other is perpendicular to OP (where O is the origin and P is the particle's position), what can be said about the force acting on the particle?
A particle is moving under a central force F, and its motion is described by the equations (m(\ddot{r} - r\dot{\theta}^2) = -F) and (\frac{d}{dt}(r^2\dot{\theta}) = 0). What does the second equation imply?
A particle is moving under a central force F, and its motion is described by the equations (m(\ddot{r} - r\dot{\theta}^2) = -F) and (\frac{d}{dt}(r^2\dot{\theta}) = 0). What does the second equation imply?
What is the differential equation that describes the path of a particle under a central force, where (u = 1/r)?
What is the differential equation that describes the path of a particle under a central force, where (u = 1/r)?
What physical quantity does the constant (h) represent in the analysis of central force motion, and how is it related to the particle's motion?
What physical quantity does the constant (h) represent in the analysis of central force motion, and how is it related to the particle's motion?
What condition defines an apsidal point in a central force orbit?
What condition defines an apsidal point in a central force orbit?
What is the term for the angle between two consecutive apsidal points in a central force orbit?
What is the term for the angle between two consecutive apsidal points in a central force orbit?
If a particle moves under a central force that results in a circular orbit, what can be said about the speed of the particle?
If a particle moves under a central force that results in a circular orbit, what can be said about the speed of the particle?
A particle is projected from an apsidal distance (a) with a speed equal to (\sqrt{2}) times the speed for a circular orbit of radius (a). What is the equation of the path?
A particle is projected from an apsidal distance (a) with a speed equal to (\sqrt{2}) times the speed for a circular orbit of radius (a). What is the equation of the path?
What general equation relates the force to u
in a central orbit?
What general equation relates the force to u
in a central orbit?
What shape of orbit would one expect if (n = 1)?
What shape of orbit would one expect if (n = 1)?
What formula is used to describe the tangent made as the distance between a curve and a vector nears zero?
What formula is used to describe the tangent made as the distance between a curve and a vector nears zero?
In what direction would there be zero traverse acceleration?
In what direction would there be zero traverse acceleration?
What is the simplified APSE distance equation?
What is the simplified APSE distance equation?
What formula would express the relationship between a wire on the horizontal plane to a vertical wire?
What formula would express the relationship between a wire on the horizontal plane to a vertical wire?
If a particle can experience a force (\mu u^3) what equation would one use?
If a particle can experience a force (\mu u^3) what equation would one use?
If angular momentum is conserved can it only move in one way?
If angular momentum is conserved can it only move in one way?
If considering the force on an object, what direction would also need considering?
If considering the force on an object, what direction would also need considering?
Flashcards
Cartesian Coordinates
Cartesian Coordinates
A coordinate system using two perpendicular axes (x, y) to define a point's position.
Polar Coordinates
Polar Coordinates
A coordinate system using distance from origin (r) and angle (θ) to define a point's position.
Motion in Cartesian Coordinates
Motion in Cartesian Coordinates
Components of acceleration, velocity and displacement. Found using integration.
Angle φ in Polar Coordinates
Angle φ in Polar Coordinates
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Apses
Apses
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Apsidal Distance
Apsidal Distance
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Central Orbit
Central Orbit
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Apsidal Angle
Apsidal Angle
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Central Force
Central Force
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h
h
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Study Notes
- Studying the motion of a particle in two dimensions involves understanding different coordinate systems.
- Four types of coordinate systems are commonly used: Cartesian, Polar, Central paths, and Tangential coordinates.
Cartesian Coordinates
- This system uses two perpendicular axes, traditionally labeled ox and oy.
- A particle's position, denoted as p, can be described at any given moment using these axes.
- Both acceleration and velocity have components along each axis.
- The position vector r can be expressed as r = xi + yj, where x and y are the coordinates along the ox and oy axes, respectively, and i and j are unit vectors in the positive direction of each axis.
- Similarly, velocity v is expressed as v = vxi + vyj, and acceleration f as f = fxi + fyj.
- If the acceleration f is known, both velocity v and position r can be determined through integration.
Polar Coordinates
- In this system, the position of a particle P is defined by coordinates (r, θ).
- Where r is the radial distance from the origin and θ is the angle with respect to the ox axis.
- i and j represent unit vectors in the directions of ox and oy.
- Unit vectors r̂ and θ̂ represent the directions of increasing r and θ, respectively.
- It is clear by figure that r̂ = icosθ + jsinθ and θ̂ = -isinθ+ jcosθ.
- Taking the derivative of r̂ and θ̂ with respect to time, we get r̂’ = θ’θ̂ and θ̂’ =-θ’r̂.
- The position vector from the origin to P can be expressed as r = oP = rr̂
Velocity in Polar Coordinates
- Velocity has two components:
- ṙ, which indicates the rate of change of radial distance in the direction of increasing r.
- rθ̇, which represents the tangential velocity component in the direction of increasing θ.
Acceleration in Polar Coordinates
- The acceleration f in polar coordinates is given by:
- fr = r̈ - rθ̇2 (radial component)
- fθ = rθ̈ + 2ṙθ̇ = 1/r d/dt (r2θ̇) (tangential component)
- The radial component (r̈ - rθ̇2) is also called the radial acceleration.
- The tangential component rθ̈ + 2ṙθ̇ also is called the transverse acceleration.
Examples of motion in polar Coordinates
- A particle P moves in a plane such that the components of its velocity are constant, one of the components is along a constant line ox and the other is perpendicular to oP. Find the equation of the particle's path. If a force that always acts in the direction of Po impacts particle P, prove that this force is inversely proportional to the square of the distance between it and 0.
- assume that are V1 and V2 where V1 is velocity in direction of ox and V2 the other in direction of oQ. Also á¹™ is the component of velocity in increasing direction r.
- therefore V1 = ṙcosθ and V2 = rθ̇ + V1sinθ
- from this by separating the variables ∫dr/r=∫V1cosθ/(V2-V1sinθ)
- this will lead to the formula r = l/(1-µsinθ), (where l=C/V2 and µ=V1/V2).
- this (above) is the equation of the particle's path
- The magnitude of the force that is affecting to that trajectory is F = (mlh^2/r) , (l=(C/V2 or µ/V2) and hl= (µcosθ) -From differential geometry (dr/dt dθ/dt dθ/dr)=(2/r^3)
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