PPT-Velocity & Acceleration

M echanics the study of the motion of objects we focus on the language principles and laws that describe and explain the motion of objects Kinematics is the science of describing the motion of objects using words diagrams numbers graphs and equations . Section 3.4a. The difference quotient:. When we let . h. approach 0, we saw the rate at which a function. w. as changing at a particular point . x. …. Definition: Instantaneous Rate of Change. The . What Is Motion?. Motion. is when an object changes place or position. To properly describe motion, you need to use the following:. Start and end position?. Movement relative to what?. How far did it go?. Average speed. Speed is a . scalar. variable. Unit . = . length over time (m/s. ). Instantaneous velocity. Speed and direction of object at a particular instant in time. Velocity is a . vector. A . vector quantity. is a quantity that has both magnitude and direction. Velocity, acceleration, and force are examples of vector quantities. . A . scalar quantity. is a quantity that has magnitude, but no direction. Time, mass, volume, and speed are examples of scalar quantities.. ACT/PSAE practice. Intro to acceleration. What does it mean in common language?. What does it mean to a physicist? (That’s you!). First equation of acceleration. A = v/t. Standard unit for acceleration: m/s^2. Describe the speedometer on a car that is entering a highway, drives for 25 miles and then exits the highway.. Consider the two situations below. When a shuttle bus approaches a stop, the driver begins to apply the brakes to slow down 5.0 s before actually reaching the stop. The speed changes from 9.0 m/s to 0 m/s over time.. Separation of motion in x-and y-direction . Equations for 2-d kinematics at constant acceleration. Projectile motion. Lecture 4: Motion in two dimensions. Velocity. , . .  . Position vector . Velocity and acceleration Measuring an objects motion speed Speed is calculated by dividing distance by time S = d/t 5.0 km/h 2.5 m/s 45 mph velocity Velocity is the same as speed, but you tell the direction of motion in the answer. Acceleration is a change in velocity. Speed or direction. Centripetal Acceleration. Acceleration can mean a change in direction, not just speed. Centripetal acceleration. Acceleration that occurs in a circular motion. What Is Motion?. Motion. is when an object changes place or position. To properly describe motion, you need to use the following:. Start and end position?. Movement relative to what?. How far did it go?. V. ector quantity: . magnitude (value) & direction. R. ate . at which an object changes its velocity. . “. How fast an object is getting faster”. If the velocity of an object is changing, it is accelerating!. 2016. Measuring Distance. Meter . – . international unit for measuring distance.. = 50 m. 1 mm. Calculating Speed. Speed. (S) . = distance traveled (d) / the amount of time it took (t). . S = d/t. 3.2. 3.2 Acceleration. Think about a car at a stop light. When the light turns green, the car starts moving and the car’s velocity increased. The car began accelerating. Acceleration is the change in velocity divided by the time it took the change to occur. Lesson . 2. Position with Constant Acceleration. The graph shows that the car’s motion is not uniform: The displacements for equal time intervals on the graph get larger and larger.. The slope of a position-time graph of a car moving with a constant acceleration gets steeper as time goes on..