Acceleration and accelerated motion

Acceleration and accelerated motion

1. Acceleration

   • acceleration can be determined graphically
     • velocity-time graph
   • average acceleration is velocity change over time
     • units of acceleration
   • changes in speed and direction cause acceleration
     • detecting velocity and acceleration

2. objects can accelerate or decelerate

   • when velocity and acceleration have opposite signs the speed decrease

3. acceleration can change withh time or be constant

   • instantaneous and constant acceleration

4. free fall

   • the acceleration due to gravity is denoted as a
     • symbol g
   • freely falling objects have constant acceleration
     • galileo galilei
   • many situations approximate free fall
     • air resistance
   • freely falling objects are always accelerating
     • gravity
   • positions and velocity change differently in free fall
     • symmetry of motion

5. position time graphs for constant accelrations

   • positions time graphs of accelerated motion are not linear
     • acceleration and curvature
   • position time graphs can track multiple objects
     • position time curves
   • graphs can show acceleration and deceleration
     • apogee

6. motion with constant acceleration

   • velocity position equation
   • acceleration causes velocity to change with position
   • positions is related to accelerated and time
     • position time equeation for constant acceleration
   • average velocity is easy to calculate
     • when the acceleration is constant the averga velocity is queal to the sum of the initial and final velocities divided by 2
   • multypliyng acceleration and time gives the change in velocity
     • velocity time equation
     • average velocity is used in queationof motion
       • a velocity time graph indicates distance traveled
         • the distance traveled by an object is equal to the area under its velocity time curve
       • position time equationwith initial and final velocity
         • position time equation with average velocity