AP Physics 1 Summary

AP Physics 1 Summary Displacement - CORRECT ANSWER-How far an object ends up from its initial position, regardless of its total distance traveled Average velocity - CORRECT ANSWER-Displacement divided by the time interval over which that displacement occurred Instantaneous velocity - CORRECT ANSWER-How fast an object is moving at a specific moment in time Position-Time Graph - CORRECT ANSWER-- to determine how far from the detector an object is located, look at the vertical axis of the graph - to determine how fast an object is moving, look at the slope of the graph - to determine which way an object is moving, look at positivity or negativity of the slope (positive=towards, negative=away) Velocity-Time Graphs - CORRECT ANSWER-- to determine how fast an object is moving, look at the vertical axis of the graph - to determine which way an object is moving, look whether the graph is positive or negative (positive=towards, negative=away) - to determine how far an object travels, determine the area under the curve (not possible to determine how far from the detector the object travels) Acceleration - CORRECT ANSWER-The rate at which velocity changes - object speeds up, acceleration in direction of motion - object slows down, acceleration opposite direction of motion Kinematic equations - CORRECT ANSWER-Use if three of five variables are known: v=v(initial) + at (Delta)x=v(initial)t + 1/2at^2 v^2=v(initial)^2 + 2a(delta)x Occasionally helpful: (Delta)x=1/2t(v(initial)+v) Projectile motion - CORRECT ANSWER-Acceleration: Vertical - 10 [9.8] m/s^2 Horizontal - 0 Velocities in perpendicular directions add Equilibrium - CORRECT ANSWER-Moving in straight line at constant speed (including rest) Net force = 0 Force - CORRECT ANSWER-Push or pull that acts on an object, measured in Newtons Newton's 2nd Law - Forces acting in the same directions add, opposite directions subtract to determine the net force; Net force always in direction of acceleration; Fnet=ma, a=F/m; magnitude means amount of the resultant force Mass - CORRECT ANSWER-The amount of matter in an object, SI unit is kg Using x- and y-components - CORRECT ANSWER-Any diagonal force can be written in terms of two perpendicular force components Draw line from head of vector to axis When the angle is measured from the horizontal, the horizontal component is the magnitude times cos and the vertical is the magnitude times sin Normal Force - CORRECT ANSWER-Force of a surface on an object in contact with that surface; acts perpendicular to a surface Read by a platform scale Solving problems with forces - CORRECT ANSWER-1. free body diagram 2. sum forces in