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Kinematics. MYIB/Honors Physics . Defining the important variables. Kinematics is. The 3 Kinematic equations . There are 3 major kinematic equations that can be used to describe the motion in DETAIL. All are used when the acceleration is CONSTANT. Example #1.

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kinematics

Kinematics

MYIB/Honors Physics

the 3 kinematic equations
The 3 Kinematic equations

There are 3 major kinematic equations that can be used to describe the motion in DETAIL. All are used when the acceleration is CONSTANT.

example 1
Example #1

Example:A boat moves slowly out of a marina (so as to not leave a wake) with a speed of 1.50 m/s. As soon as it passes the breakwater, leaving the marina, it throttles up and accelerates at 2.40 m/s2.

a) How fast is the boat moving after accelerating for 5 seconds?

example 1 continued
Example #1 Continued

b) How far did the boat travel during that time?

example 2
Example #2

Example:You are driving through town at 12 m/s when suddenly a ball rolls

out in front of your car. You apply the brakes and begin decelerating at

3.5 m/s2 .

How far do you travel before coming to a complete stop?

common problems students have
Common Problems Students Have

I don’t know which equation to choose!!!

examples
Examples

A car accelerates from 12.5 m/s to 25 m/s in 6.0 seconds. What was the acceleration?

examples9
Examples

How long does it take a car at rest to cross a 35.0 m intersection after the light turns green, if the acceleration of the car is a constant 2.00 m/s2?

examples10
Examples

A stone is dropped at rest from the top of a cliff. It is observed to hit the ground 5.78 s later. How high is the cliff?

examples11
Examples

A pitching machine throws a fastball with a velocity of 15.0 m/s. The ball is inserted into the back of a tube that has a length of 1.25 meters. The ball is “fired” out of the other end towards the batter. How much time elapses from the time the ball is inserted in one end of the tube until it is fired from the other end?

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