# Physics

 Acceleration directed toward the center of a circular path Centripetal Acceleration The motion of a body when only the fource of gravity is acting on it Freefall Motion of an object revolving about a single axis Circular motion the speed of an object in circular motion Tangential speed T^2=r^3 Kepler's 3rd Law Motion of an object when tangential speed is constant Uniform Circular Motion Force that causes centripetal acceleration Centripetal Force The mutual force of attraction between particles of matter Gravitational Force The speed needed to "break free" from a gravitational field. Escape Velocity An object whose escape velocity is greater than the speed of light Black Hole Each planet travels in an elliptical orbit around the sun, and the sun is at one of the focal points. Keplers 1st law The line about which circular motion occurs. Axis of rotation The time it takes to complete one cycle of revolution or wave oscillation Period The product of the force and the lever arm Torque One of six types of machines designed to make work easier Simple Machine Perpendicular distance from the axis of rotation to a line drawn along the direction of force Lever Arm an imaginary line drawn from the sun to any planet sweeps out equal areas in equal time periods Kepler's 2nd law An object that revolves around a central body. Satellite A device that changes the force needed to do work Machine AuthorAnonymous ID202647 Card SetPhysics DescriptionPhysics Vocab Updated2013-02-23T00:36:11Z Show Answers