# Potential and Kinetic Energy – SCI103 Phase 5 Lab Report

Assignment: SCI103
Phase 5 Lab Report

TITLE: Potential
and Kinetic Energy

INSTRUCTIONS:
Enter the Virtual Lab and conduct the experiments provided. Please type your
answers on this form. When your lab report is complete, submit it to the
Submitted Assignments area of the Virtual Classroom.

the following questions while in the Phase 5 lab environment.

Section 1 – From the left of the screen to the
right, the red balls have a center
of mass placed at 20 feet, 15 feet, and 10 feet high respectively.

1. Suppose
each red ball weighs 20 lbs.  Find the
potential energy (PE) for each ball
on each ramp.  In this lab mass is given
in pounds and height is in feet, so use 32.2
ft/sec2 as the gravitational constant
units are being used.

PE
= m g h   where g = 32.2 ft/sec2

Ramp
1:

Ramp
2:

Ramp
3:

2. Predict
the maximum speed (velocity) of each ball on each ramp.  How would this speed change if each ball’s
mass was doubled?  ASSUMPTION: assume there is no friction and that all the potential
energy you calculated in question 1 is transformed into kinetic energy – PE =
KE.  Use the following equation.

KE=
½ m v2

You
want to calculate v maximum speed

v
= [KE/ ½ m]½

This
means divide the KE by half the mass and then take the square root.

 Max v for 20 lb. ball Max v for 40 lb. ball Ramp 1 Ramp 2 Ramp 3

Section 2 (Each of the green balls has a center of
mass placed at 20 feet high).  While each
ramp looks identical, each ramp has a different amount of friction.

1. Which
ramp has the greatest friction?

2. Suppose
each green ball weighs 10 lbs.  Assuming
there is no friction, calculate the potential energy for each ball on each
ramp.

3. Again
assuming there is no friction; predict the maximum speed of the ball on each
ramp.  On which ramp does the ball come
closest to achieving this max speed?

Use
this table to organize your calculated values

 PE Max Seed (v) Ramp 1 Ramp 2 Ramp 3

Part
II –
For the following questions, provide your response
in short answer format (2-3 sentences each). Use this Phase’s activities and
resources to assist you in answering:

1. What
is Potential Energy (PE)?  Give
examples from the lab.

2. What is Kinetic Energy (KE)? Give examples from the lab.

3. What
is Inertia?

4. What
is Gravity? How is it a type of potential energy?

5. What is Mass and
how does it affect energy?

6. How
do Potential and Kinetic energy (gravity and mechanical force) apply to the Law
of Conservation of Energy?

7. What
is Friction? How does it affect energy use? 