Conceptual Physics by Hewitt C H A P T E R 2- Linear Motion http://www.youtube.com/watc h?v=hz65AOjabtM
Slide 1
Conceptual Physics by HewittC H A P T E R 2-Linear Motion
http://www.youtube.com/watch?v=hz65AOjabtM
PowerPoint 2.8Acceleration Math ProblemsHow to mathematically solve kinematic problems that involve acceleration.
Average velocity if traveling in a straight line.
Vave = v
= d/t
= x/ t = (xf xi)/ (tf - ti )
AccelerationIf an object is moving in a straight line
Units of acceleration:Distance/ time = distance/time2 timem/s2= v /t = (vf vi)/(tf - ti)
Acceleration due to the force of gravity10 m/s2
Average velocity when acceleration is constant.
Equation with a, t, vi, and vf
Equation with d, vi, a and t
Equation with Vi, Vf, a, and d
Example 1. A car slows down at a constant rate from 100 km/hr to 30 km/hr in 10 seconds. What is the average velocity during this time?
What initial vertical velocity is a rock thrown down if its velocity 5 seconds after being thrown is 70 m/s?
How much time will it take a car to go down a 100-meter track from a stationary position if it accelerates at 10 km/hr every second?
If you throw a ball up with an initial velocity of 30 m/s, how high will the ball go?
What is the initial velocity of a ball thrown in the air if it reaches a height of 2 meters?
More help ..http://www.bozemanscience.com/speed-velocity-acceleration http://www.khanacademy.org/science/physics/one-dimensional-motion
Go to next slideYour turn to solve a problem... If you dropped an egg from the top of the bleachers, which are 5 meters above the ground, at what velocity will it hit the ground?
Solve and send the answer to me ([email protected])
If you need help selecting the right equation, go to the next slide.
A common physics project is to design a device to protect an egg from breaking when dropped from an elevated platformUse Equation 5