falling bodies | Summary - Acceleration |

falling objects | The Motion of Falling Objects |

field | Superposition of electric fields |

field of force | Summary - Fields |

field vector | Field Vectors |

first law of Newton | Newton’s First Law |

fission | The Strong Nuclear Force, Alpha Decay and Fission |

fluid | Pressure |

focal length | The Lensmaker’s Equation |

| How strong are your glasses? |

force | Force, Energy, and Power |

| Calculating Work |

| Work in Three Dimensions |

| Forces at other angles |

| Varying Force |

| When Does Work Equal Force Times Distance? |

| Summary - Work |

| Applications of Calculus |

| Relationship between force and torque |

| Classification and Behavior of Forces |

| Analysis of Forces |

| Transmission of Forces by Low-Mass Objects |

| Simple Machines: The Pulley |

| Summary - Forces |

| Force |

| Newton’s First Law |

| What Force Is Not |

| Summary - Perpendicular Forces |

| Summary - Introduction to Physics |

frame of reference | Inertial and Noninertial Frames of Reference |

fraud | Millikan’s Fraud |

free fall | Terminal velocity for falling objects |

| Summary - Acceleration |

frequency | Period, Frequency, and Amplitude |

| Period and Frequency |

| Wave Velocity |

friction | The Search for a Perpetual Motion Machine |

| Summary - Forces |

frictional force | A violin |

| Dragging a refrigerator at constant velocity |

fuse | Applications of Resistors |

fusion | Energy production in the sun |

| Fusion |

| A reaction occurring in the sun |