Presentation on theme: "Linear Acceleration 12th grade Physics Class What are we doing?"— Presentation transcript:
1 Linear Acceleration12th grade Physics ClassWhat are we doing?
2 Learning ObjectivesWe are going to learn a couple of Newtonian Physics equations that will allow us to calculate values of time, acceleration, displacement, and velocity for objects accelerating in a straight line.Get Stared!
3 So what are the equations? Using EquationsNewtonian equations that have been derived from basic physics laws can be used to easily relate acceleration, time, velocity, and displacement.An unknown value can be found by inserting known factors for the rest of the variables.These are the variables that will be seen in the equations Vf = final velocity (m/s) Vi = initial velocity (m/s) a = acceleration (m/s*2) t = time (s) d = displacement (m)So what are the equations?
4 Linear Acceleration Equations Vf = Vo + atVf*2 = Vo*2 + 2adThis equation relates the change in velocity and acceleration to timeThis equation relates the change in velocity and acceleration to displacementI’m ready to see them in action!
5 Example Problem: If a ball is dropped from cliff, how fast will it be traveling after 4 seconds? (ignore air resistance)First, find the known variables:We know the time the ball is traveling is t=4sThe acceleration of a falling object is the same as gravity, a=9.8m/s*2We know the initial velocity of the ball, Vo=0m/sNow plug them into the equation to find the final velocity: Vf = 0m/s + (9.8m/s*2 x 4s)Using basic math, we find that final velocity = 39.2m/sNow you try! Begin Quiz
6 A car at rest begins to accelerate at a constant rate of 6m/s. 2 A car at rest begins to accelerate at a constant rate of 6m/s*2. How long will it take the car to reach a speed of 24 m/s?4 m/s18 s4 sπ
7 Incorrect! Make sure you’re using the right equation and remember to check your math and units! Try Again
8 That’s right!! You should have used the equation: Vf = Vo + at Next Question
9 A boy throws a rock directly downward at a speed of 5m/s off the roof of a building. When it hit the ground, the rock was moving at a staggering 73 m/s. Negating air resistance, how tall was the building?271.9 m270.6 m541.2 m3.5 m
10 Incorrect! Remember, the rock had an initial velocity that needs to be accounted for Try Again
11 That’s right!! You should have used the equation: Vf*2 = Vo*2 + 2ad Restart LessonRetake Quiz