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  1. AP Calculus
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Explain how to find the velocity and acceleration from a position vector.

Velocity is the first derivative of the position vector with respect to time. Acceleration is the second derivative of the position vector with respect to time.

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Explain how to find the velocity and acceleration from a position vector.

Velocity is the first derivative of the position vector with respect to time. Acceleration is the second derivative of the position vector with respect to time.

Explain how to integrate a vector-valued function.

Integrate each component of the vector-valued function separately.

Explain how to find the slope of a tangent line to a parametric curve.

Find dydx\frac{dy}{dx}dxdy​ by calculating dy/dtdx/dt\frac{dy/dt}{dx/dt}dx/dtdy/dt​. Evaluate at the given t-value.

What does the derivative of a vector-valued function represent?

The velocity vector of the particle at that point.

How do you find the points where a parametric curve has a horizontal tangent?

Find where dydt=0\frac{dy}{dt} = 0dtdy​=0 and dxdt≠0\frac{dx}{dt} \neq 0dtdx​=0.

How do you find the points where a parametric curve has a vertical tangent?

Find where dxdt=0\frac{dx}{dt} = 0dtdx​=0 and dydt≠0\frac{dy}{dt} \neq 0dtdy​=0.

How do you find the area enclosed by a single polar curve?

Use the formula A=12∫abr2dθA = \frac{1}{2} \int_{a}^{b} r^2 d\thetaA=21​∫ab​r2dθ, where r is the polar function and a and b are the limits of integration.

How do you find the area enclosed by two polar curves?

Use the formula A=12∫ab(R2−r2)dθA = \frac{1}{2} \int_{a}^{b} (R^2 - r^2) d\thetaA=21​∫ab​(R2−r2)dθ, where R is the outer curve and r is the inner curve.

Explain the relationship between position, velocity, and acceleration in vector-valued functions.

Velocity is the derivative of position, and acceleration is the derivative of velocity (or the second derivative of position).

How do you determine the direction of motion of a particle described by parametric equations?

Analyze the signs of dxdt\frac{dx}{dt}dtdx​ and dydt\frac{dy}{dt}dtdy​. Positive dxdt\frac{dx}{dt}dtdx​ means moving right, negative means moving left. Positive dydt\frac{dy}{dt}dtdy​ means moving up, negative means moving down.

What are the differences between parametric equations and Cartesian equations?

Parametric: x and y are functions of t | Cartesian: y is a function of x

What are the differences between integrating vector-valued functions and integrating scalar functions?

Vector-Valued: Integrate each component separately, result is a vector | Scalar: Integrate a single function, result is a scalar

What are the differences between finding the area between curves in Cartesian coordinates vs. polar coordinates?

Cartesian: Integrate difference of functions wrt x, A = ∫(top - bottom) dx | Polar: Integrate difference of squared polar functions wrt θ, A = 1/2 ∫(R² - r²) dθ

What are the differences between velocity and speed?

Velocity: Vector quantity with magnitude and direction | Speed: Scalar quantity, magnitude of velocity

What are the differences between position vector and velocity vector?

Position Vector: Represents location at a given time | Velocity Vector: Represents rate of change of position at a given time

What are the differences between polar coordinates and Cartesian coordinates?

Polar: Defined by radius and angle (r, θ) | Cartesian: Defined by horizontal and vertical distance (x, y)

What are the differences between differentiating parametric equations and differentiating Cartesian equations?

Parametric: Use chain rule, dydx=dy/dtdx/dt\frac{dy}{dx} = \frac{dy/dt}{dx/dt}dxdy​=dx/dtdy/dt​ | Cartesian: Direct differentiation, dydx\frac{dy}{dx}dxdy​

What are the differences between integrating parametric equations and integrating Cartesian equations?

Parametric: Integrate with respect to t | Cartesian: Integrate with respect to x

What are the differences between vector-valued functions and scalar functions?

Vector-valued: Output is a vector | Scalar: Output is a single number

What are the differences between finding arc length in Cartesian coordinates vs. parametric coordinates?

Cartesian: Integrate 1+(dy/dx)2\sqrt{1 + (dy/dx)^2}1+(dy/dx)2​ dx | Parametric: Integrate (dx/dt)2+(dy/dt)2\sqrt{(dx/dt)^2 + (dy/dt)^2}(dx/dt)2+(dy/dt)2​ dt

How to find the velocity vector at t=a given a position vector r(t)?

  1. Find the derivative r'(t). 2. Evaluate r'(a).

How to find the acceleration vector at t=a given a position vector r(t)?

  1. Find the second derivative r''(t). 2. Evaluate r''(a).

How to find the arc length of a parametric curve from t=a to t=b?

  1. Find dxdt\frac{dx}{dt}dtdx​ and dydt\frac{dy}{dt}dtdy​. 2. Use the formula L=∫ab(dxdt)2+(dydt)2dtL = \int_{a}^{b} \sqrt{(\frac{dx}{dt})^2 + (\frac{dy}{dt})^2} dtL=∫ab​(dtdx​)2+(dtdy​)2​dt.

How to find the area of a polar region?

  1. Determine the limits of integration, a and b. 2. Identify the polar function r(θ). 3. Use the formula A=12∫abr2dθA = \frac{1}{2} \int_{a}^{b} r^2 d\thetaA=21​∫ab​r2dθ.

How to find the area between two polar curves?

  1. Determine the limits of integration, a and b. 2. Identify the outer curve R(θ) and the inner curve r(θ). 3. Use the formula A=12∫ab(R2−r2)dθA = \frac{1}{2} \int_{a}^{b} (R^2 - r^2) d\thetaA=21​∫ab​(R2−r2)dθ.

How to find the equation of a tangent line to a parametric curve at t=t₀?

  1. Find dydx=dy/dtdx/dt\frac{dy}{dx} = \frac{dy/dt}{dx/dt}dxdy​=dx/dtdy/dt​. 2. Evaluate dydx\frac{dy}{dx}dxdy​ at t=t₀ to find the slope. 3. Find x(t₀) and y(t₀) to find the point. 4. Use point-slope form to write the equation of the tangent line.

How to convert a point from polar coordinates (r, θ) to Cartesian coordinates (x, y)?

  1. Use the formulas x = r cos(θ) and y = r sin(θ). 2. Substitute the values of r and θ into the formulas. 3. Calculate x and y.

How to find the maximum height of a particle moving according to parametric equations?

  1. Find dydt\frac{dy}{dt}dtdy​. 2. Set dydt=0\frac{dy}{dt} = 0dtdy​=0 and solve for t. 3. Find the y-coordinate at that t value.

How to determine when a particle changes direction in its x-coordinate movement?

  1. Find dxdt\frac{dx}{dt}dtdx​. 2. Set dxdt=0\frac{dx}{dt} = 0dtdx​=0 and solve for t. 3. Check if the sign of dxdt\frac{dx}{dt}dtdx​ changes around that t value.

How to determine the speed of a particle given its velocity vector?

  1. Find the velocity vector v(t) = <dx/dt, dy/dt>. 2. Calculate the magnitude of the velocity vector: speed = (dxdt)2+(dydt)2\sqrt{(\frac{dx}{dt})^2 + (\frac{dy}{dt})^2}(dtdx​)2+(dtdy​)2​