# Homework Help: Kinetic energy lab

1. Feb 2, 2009

### McSara

I'm having some difficulty in an online class.
Here is a screen shot for reference:

1. The problem statement, all variables and given/known data:
I'm doing a physics lab (screen shot is available above). The procedure says:
The small object I'm using is a small pecan in it's shell.
As you can see from the screen shot I have already recorded the time column from the experiment.
I'm having a difficult time with kinematic velocity (because I don't understand the equation) and the kinetic energy (because the KE formula asks for mass and I do not know the mass of the almond. This lab was not specific to mass, only specific of using a small object. More specifically it says: to use a "small object (thread spool, small ball)")

2. Relevant equations:
Kinematic velocity = v0 + acceleration*time
Kinetic Energy = ½mv^2 = mgh

3. The attempt at a solution:
I don't know how to go about either one of these. I'm sorry. The book is confusing me, too.

2. Feb 2, 2009

### LowlyPion

Welcome to PF.

One thing should make it easier for you.

The kinetic energy V doesn't depend on mass. If you will note it cancels out of both sides of the equation.

Hence your kinetic V is (2*g*h)1/2
Your kinematic V is simpler and is just g*t

Be careful of your units. 1 column is m/s. The other is ft/s.

3. Feb 2, 2009

### tiny-tim

Welcome to PF!

Hi McSara! Welcome to PF!

It isn't kinematic velocity, it's a kinematic equation.

v is just ordinary velocity.