# Catapult Physics

1. Jun 10, 2007

### fishmonkeys

1. The problem statement, all variables and given/known data

How simple mechanics equations can be used to describe force, acceleration, speed, distance, etc. of a catapult.

2. Relevant equations

This is my question. I have the time and distance travelled already, I'm hoping for some help as to what formulas to use. I don't need them filled out for me, just some suggestions as to what formulas will describe which parts

3. The attempt at a solution

Not necessary, just some general formula help...I am fine with formulas and explanations based on formulas once I get them, but my formulas were all in my physics book, which I no longer have.

2. Jun 10, 2007

### esalihm

do u mean the catapult itself or the thing it throws?

3. Jun 10, 2007

### fishmonkeys

The projectile being thrown.

4. Jun 10, 2007

### esalihm

if u neglect air friction u can use consevation of energy,

then u have the basic projectile equations which are similar to one dimentional kinematics equatios:

range = v(x) * time
[v(y)(final)]^2 = [v(y)(initial)]^2 + 2*g*h
delta y= [v(y)(initial)]*t + (g*t^2)/2
and u can always use x=v*t

u can also use conservation of the momentum for relative movements of the projectile and the catapult itself