Newton’s Laws video What is the equation that summarizes the science of motion? Force= mass x acceleration What are the two complications of this equation? Force and acceleration are vectors with directions Acceleration is how fast something changes (a derivative of a derivative) What do you call an object moving both forward and under the influence of gravity? Projectile What direction does gravity act? Downward Does it matter what direction the object is moving? No State the concept of inertia: An object continues in its present state of uniform motion unless acted upon by external forces What is the vertical component of the force vector? Acceleration of gravity What is acceleration? Change in velocity over a certain interval of time How much does the horizontal speed of projectiles change? Not at all Who discovered the nature of the path of a projectile? Galileo What is the mathematical description of the downward force on a projectile? F = -mg g acts downward, so it is negative

What did Newton do to amplify the description of projectile motion? Decomposed it into two independent vectors, and described with math Horizontal motion = distance x time: the velocity in the horizontal direction, which does not change Vertical motion = acceleration ÷ time: change in vertical speed over time, which does change