AP Physics 1 Advanced Answer.

What two entities comprise a vector? - correct answer Magnitude and direction What do you do with any vector that is not on either the x or y axis? - correct answer Break it up into x and y components using trig, add up the components. How are velocity and speed different? - correct answer Velocity has a direction and speed does not have direction. What quantity is calculated from slope of the displacement versus time graph? - correct answer velocity What does upward slope on a displacement versus time graph imply about the velocity. - correct answer The velocity is positive What is acceleration? - correct answer How quickly you change velocity. What is the area under the velocity time graph? - correct answer Displacement What is the y intercept of the velocity time graph? - correct answer The initial velocity, (Vo in the formulas) What is the area under the acceleration versus time graph? - correct answer The CHANGE in velocity. What is the horizontal acceleration of projectiles? - correct answer ZERO What direction controls time in falling body and projectile motion problems? - correct answer Vertical direction What do you know about two objects that are launched at different horizontal velocities? - correct answer They fall, vertically, the by the same amount in the same time. What equation describes the distance that a dropped object falls "t" seconds after it started moving? - correct answer x=(1/2)at^2 Remember, the word "dropped" implies no initial velocity. What equation describes the distance that a horizontally launched projectile falls t seconds after it started moving? - correct answer x=(1/2)at^2 ...Horizontal velocity does not affect the time of fall. What equation describes the speed of a dropped object "t" seconds after it started moving? - correct answer V=Vo + at ...The word "dropped" means no initial velocity. What equation describes the speed in the x-direction of a projectile "t" seconds after it started moving? - correct answer Vx=(Vxo)t ...Recall that there is no acceleration in the horizontal direction. What equation describes the speed in the y-direction of a projectile "t" seconds after it started moving? - correct answer Vy=Vyo + gt ...Watch the signs. What is implied when an object is not accelerating in the x direction? - correct answer The body is moving at a constant velocity What is implied when an object is not accelerating in the y direction? - correct answer g=zero so h=(Vyo)t When is sum of force (net force) zero. - correct answer When a body is moving at a constant velocity or not moving at all. When is sum of force (net force) NOT zero. - correct answer When a body's speed is changing. What force is always present, and what is its equation? - correct answer Weight ...w=mg