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| Step | Derivation / Formula | Reasoning |
|---|---|---|
| 1 | \[v_x = \text{constant}\] | The ball leaves the hand with the same horizontal speed as the train because no horizontal forces act on it inside the car. |
| 2 | \[\Delta x = v_x t\] | Horizontal displacement of both ball and thrower grows equally with time. |
| 3 | \[\Delta x_{\text{relative}} = 0\] | Since their \(v_x\) values are identical, their relative horizontal separation is zero; the ball returns to the thrower’s hand. |
| Step | Derivation / Formula | Reasoning |
|---|---|---|
| 1 | \[v_x(t)=v_i\] | The ball keeps the train’s speed \(v_i\) at release; it experiences no forward force. |
| 2 | \[x_{\text{ball}}=v_i t\] | Ball’s ground‐frame horizontal motion. |
| 3 | \[x_{\text{car}}=v_i t+\tfrac12 a t^{2}\] | Car accelerates with acceleration \(a\) (forward). |
| 4 | \[\Delta x_{\text{relative}}=x_{\text{ball}}-x_{\text{car}}=-\tfrac12 a t^{2}<0\] | Relative displacement is negative (toward rear). Hence the ball lands behind the thrower. |
| Step | Derivation / Formula | Reasoning |
|---|---|---|
| 1 | \[a_{\text{car}}=-|a|\] | Negative sign denotes slowing down. |
| 2 | \[x_{\text{car}}=v_i t-\tfrac12 |a| t^{2}\] | Car covers less distance than constant‐speed case. |
| 3 | \[\Delta x_{\text{relative}}=v_i t-(v_i t-\tfrac12 |a| t^{2})=\tfrac12 |a| t^{2}>0\] | Positive relative displacement means the ball comes down ahead of the thrower (toward the front). |
| Step | Derivation / Formula | Reasoning |
|---|---|---|
| 1 | \[a_{c}=\frac{v^{2}}{R}\] | Car acquires centripetal acceleration toward curve’s center. |
| 2 | \[F_{\text{ball}}=0\;\text{(horizontal)}\] | No horizontal force acts on the ball, so it moves straight (Newton’s 1st law). |
| 3 | \[\text{Ball lands on outer side}\] | The car turns underneath; to riders the ball drifts toward the side opposite the curve’s center — the outer (convex) wall. |
| Step | Derivation / Formula | Reasoning |
|---|---|---|
| 1 | \[F_{\text{drag}}\propto v_{\text{rel}}^{2}\] | Still outside air produces a backward drag on the rising ball. |
| 2 | \[a_{\text{drag}} < 0\] | Drag decelerates the ball’s horizontal motion relative to the ground. |
| 3 | \[\Delta x_{\text{relative}} < 0\] | Because the train keeps its speed while the ball slows horizontally, it lands behind the thrower. |
Just ask: "Help me solve this problem."
A boat is rowed directly upriver at a speed of \(2.5 \, \text{m/s}\) relative to the water. Viewers on the shore find that it is moving at only \(0.5 \, \text{m/s}\) relative to the shore. What is the speed of the river? Is it moving with or against the boat?
An object has a mass of 10 kg. For each case below answer the questions and provide an example.
A westward–moving car is changing its speed. The net force on the car ____.
When a skier skis down a hill, the normal force exerted on the skier by the hill is
A block rests on a flat plane inclined at an angle of \(30^\circ\) with respect to the horizontal. What is the minimum coefficient of friction necessary to keep the block from sliding?
\(\text{In her hand}\)
\(\text{Behind thrower}\)
\(\text{Ahead of thrower}\)
\(\text{Outer side of curve}\)
\(\text{Behind thrower}\)
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| Kinematics | Forces |
|---|---|
| \(\Delta x = v_i t + \frac{1}{2} at^2\) | \(F = ma\) |
| \(v = v_i + at\) | \(F_g = \frac{G m_1 m_2}{r^2}\) |
| \(v^2 = v_i^2 + 2a \Delta x\) | \(f = \mu N\) |
| \(\Delta x = \frac{v_i + v}{2} t\) | \(F_s =-kx\) |
| \(v^2 = v_f^2 \,-\, 2a \Delta x\) |
| Circular Motion | Energy |
|---|---|
| \(F_c = \frac{mv^2}{r}\) | \(KE = \frac{1}{2} mv^2\) |
| \(a_c = \frac{v^2}{r}\) | \(PE = mgh\) |
| \(T = 2\pi \sqrt{\frac{r}{g}}\) | \(KE_i + PE_i = KE_f + PE_f\) |
| \(W = Fd \cos\theta\) |
| Momentum | Torque and Rotations |
|---|---|
| \(p = mv\) | \(\tau = r \cdot F \cdot \sin(\theta)\) |
| \(J = \Delta p\) | \(I = \sum mr^2\) |
| \(p_i = p_f\) | \(L = I \cdot \omega\) |
| Simple Harmonic Motion | Fluids |
|---|---|
| \(F = -kx\) | \(P = \frac{F}{A}\) |
| \(T = 2\pi \sqrt{\frac{l}{g}}\) | \(P_{\text{total}} = P_{\text{atm}} + \rho gh\) |
| \(T = 2\pi \sqrt{\frac{m}{k}}\) | \(Q = Av\) |
| \(x(t) = A \cos(\omega t + \phi)\) | \(F_b = \rho V g\) |
| \(a = -\omega^2 x\) | \(A_1v_1 = A_2v_2\) |
| Constant | Description |
|---|---|
| [katex]g[/katex] | Acceleration due to gravity, typically [katex]9.8 , \text{m/s}^2[/katex] on Earth’s surface |
| [katex]G[/katex] | Universal Gravitational Constant, [katex]6.674 \times 10^{-11} , \text{N} \cdot \text{m}^2/\text{kg}^2[/katex] |
| [katex]\mu_k[/katex] and [katex]\mu_s[/katex] | Coefficients of kinetic ([katex]\mu_k[/katex]) and static ([katex]\mu_s[/katex]) friction, dimensionless. Static friction ([katex]\mu_s[/katex]) is usually greater than kinetic friction ([katex]\mu_k[/katex]) as it resists the start of motion. |
| [katex]k[/katex] | Spring constant, in [katex]\text{N/m}[/katex] |
| [katex] M_E = 5.972 \times 10^{24} , \text{kg} [/katex] | Mass of the Earth |
| [katex] M_M = 7.348 \times 10^{22} , \text{kg} [/katex] | Mass of the Moon |
| [katex] M_M = 1.989 \times 10^{30} , \text{kg} [/katex] | Mass of the Sun |
| Variable | SI Unit |
|---|---|
| [katex]s[/katex] (Displacement) | [katex]\text{meters (m)}[/katex] |
| [katex]v[/katex] (Velocity) | [katex]\text{meters per second (m/s)}[/katex] |
| [katex]a[/katex] (Acceleration) | [katex]\text{meters per second squared (m/s}^2\text{)}[/katex] |
| [katex]t[/katex] (Time) | [katex]\text{seconds (s)}[/katex] |
| [katex]m[/katex] (Mass) | [katex]\text{kilograms (kg)}[/katex] |
| Variable | Derived SI Unit |
|---|---|
| [katex]F[/katex] (Force) | [katex]\text{newtons (N)}[/katex] |
| [katex]E[/katex], [katex]PE[/katex], [katex]KE[/katex] (Energy, Potential Energy, Kinetic Energy) | [katex]\text{joules (J)}[/katex] |
| [katex]P[/katex] (Power) | [katex]\text{watts (W)}[/katex] |
| [katex]p[/katex] (Momentum) | [katex]\text{kilogram meters per second (kgm/s)}[/katex] |
| [katex]\omega[/katex] (Angular Velocity) | [katex]\text{radians per second (rad/s)}[/katex] |
| [katex]\tau[/katex] (Torque) | [katex]\text{newton meters (Nm)}[/katex] |
| [katex]I[/katex] (Moment of Inertia) | [katex]\text{kilogram meter squared (kgm}^2\text{)}[/katex] |
| [katex]f[/katex] (Frequency) | [katex]\text{hertz (Hz)}[/katex] |
General Metric Conversion Chart
Example of using unit analysis: Convert 5 kilometers to millimeters.
Start with the given measurement: [katex]\text{5 km}[/katex]
Use the conversion factors for kilometers to meters and meters to millimeters: [katex]\text{5 km} \times \frac{10^3 \, \text{m}}{1 \, \text{km}} \times \frac{10^3 \, \text{mm}}{1 \, \text{m}}[/katex]
Perform the multiplication: [katex]\text{5 km} \times \frac{10^3 \, \text{m}}{1 \, \text{km}} \times \frac{10^3 \, \text{mm}}{1 \, \text{m}} = 5 \times 10^3 \times 10^3 \, \text{mm}[/katex]
Simplify to get the final answer: [katex]\boxed{5 \times 10^6 \, \text{mm}}[/katex]
Prefix | Symbol | Power of Ten | Equivalent |
|---|---|---|---|
Pico- | p | [katex]10^{-12}[/katex] | |
Nano- | n | [katex]10^{-9}[/katex] | |
Micro- | µ | [katex]10^{-6}[/katex] | |
Milli- | m | [katex]10^{-3}[/katex] | |
Centi- | c | [katex]10^{-2}[/katex] | |
Deci- | d | [katex]10^{-1}[/katex] | |
(Base unit) | – | [katex]10^{0}[/katex] | |
Deca- or Deka- | da | [katex]10^{1}[/katex] | |
Hecto- | h | [katex]10^{2}[/katex] | |
Kilo- | k | [katex]10^{3}[/katex] | |
Mega- | M | [katex]10^{6}[/katex] | |
Giga- | G | [katex]10^{9}[/katex] | |
Tera- | T | [katex]10^{12}[/katex] |
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