current model

In class we discussed our data and developed our model. We determined that the relationship between force and energy is indirect. In other words when net force goes up energy goes down. After looking at the trend lines from the data we decided that the equation (F=21/d). however, we were able to reform this into a more applicable equation and the end result which is our current model is F(D)=21

rotation

Rotation is very similar to linear movement in the sense that the laws of motion and inertia still apply. For example we discussed in class whether or not the skater was applying a force mid spin. We determined that the skater was not applying force at the time of the spin but instead was relying on the laws of inertia to aid her in her task. Over time even with the most minute amount of friction the rotation will slow and eventually cease. However the rotational movement differs from the linear movement at one key point. The rotational movement doesn't change position.

Air pressure, spin, and curve balls

Bernoulli's principle that states if air on one side of an object moves faster than the air on the other side, that the air on the side of the slower air will create a "push" while trying to equalize the pressure by getting to the other side. This is why planes get lift, curveballs curve, and why the roof of your house gets blown off in a wind storm. Athletes such as baseball players know that spin is essential in changing the trajectory of an object. This is because when spin is created the air automatically moves faster on one side of the ball creating a push and throwing the ball off a straight trajectory.

From the paper ball toss lab that we completed in class, we determined that Air resistance is a form of friction. And like friction when it was applied to the ball while it was in flight the ball no longer flew at a constant horizontal velocity. Also the parabola relating to the ball's vertical velocity was steeper as the paper ball returned to earth.

3.1

a quantity that requires both the magnitude and direction for a complete description is a vector quantity.

a quantity that is completely described by magnitude only is a scalar quantity

3.2

the result of adding these two vectors, called the resultant is the diagonal of the rectangle.

for any square the length of its diagonal is route 2 or 1.414 times either of the sides

questions

4. a diagonal line

19. 150\250

21. 50?

journal 1

3.4
with no horizantal force acting on the ball there is no horizontal accel the same is true for the projectile-when no horizantal force acts on the projectile the horizantal velocity remains constant.

in the vertical direction there is a force due to grav

ball falls the same verticle distance in the same time

3.5
d=1/2gt (squared)

since there is no horizantal accel the object remains at a constant velocity.

at the top of the arc both velocities are equal

the deceleration due to gravity going up is the same as the acceleration due to gravity

questions

9. they are both constant accel

12.maximum altitude= 90 maximum distance 180....

35. just the verticle velocity because we determined that at the same verticle distance the object will hit the ground at the same time no matter the horizantal distance

36. 2/3 seconds (same as last one)