Gravitational+Force+lab


 * __Purpose__** - To determine the relationship between mass (m) of an object and the force due to gravity (Fg) and to create a FORCE Law to describe the effect of gravity on matter.


 * __Data__** - Collect on mass (g) and Force (N) of 10 small items of your choosing.


 * __Graph__** - Mass ( kg) vs. Force (N) [x vs. y] . ( 2 different ones - lab group and entire class)
 * Include (0,0) as point on graph.
 * Determine slope of line and formula for the graph.
 * Slope is gravitational force constant (g)
 * Y-intercept is related to error (should be zero).
 * R^2 expresses how close data is to making a straight line. Should be close to 1.0 (100%). R^2 is a measure of your precision.


 * __Calculations__** (formula, substitution, result with units)-

1. Conversion from grams to kilograms.

2. Use two points to calculate the slope of your line.

3. Use the equation (y = mx +b) from the Google sheets graph to rewrite your group's formula for gravitational force (include units).

4. Percent Error of Gravitational Force constant (slope of line) for your data: (Accepted Value = 9.8 N/kg) Formula for % error: Percent error is a measure of your accuracy.
 * Accepted Value - Experimental Value| / Accepted Value x 100 =
 * __Questions__**-

1. Define mass and describe how mass relates to this lab.

2. Define gravitational field and describe how this relates to this lab.

3. Define weight and describe how weight relates to this lab.

4. Define the unit "newton" and describe how Newtons relates to this lab.

__Conclusion-__

Restate purpose (see above)

Result - List the results of the purpose (relationship and law). Explain what slope and y-intercept mean.

Discussion - Describe the graph and formula and how it relates to your results. Include information about Newton, weight, gravity and mass.

Errors - Describe a few things that could go wrong. Talk about your precision and accuracy.