![]() ![]() use terms like increase, decrease, remains constant). Be specific and use scientific language (.e. What three things can you change in the formula that you can also change in the simulation? F = G m1m2/r^2 I can change mass 1 and mass 2 and well as radius 3) Change each variable and record what happens to the gravitational force as you change it. 2) Examine the formula for the force of gravity above. How accurate was your acceleration of gravity on Earth To find out, use the following formula: difference (your acceleration 9.8 m/s2) - X 100 9.8 m/s2 Please show your work on your graph paper and circle your answer. Part 1 - Qualitative Observations *Open the Gravity Force Lab PhET Simulation* 1) What can you change about the simulation? You can change mass 1 and mass 2 as well as the force values. Conclusion Questions 1) What is your value for G based on your data?"Include proper units 2) How close is your value for G to the accepted value? 3) What do you think contributes to the value for G's not being identical? 4) What the advantages and disadvantages of using a computer simulation for this lab? MacBook Pro 000 OOO IIĥ) What equipment or materials would you need to conduct a hands-on investigation to determine the value for G? 6) How would you define gravity based on your investigations with the computer simulation?ĪP Physics - Gravity Force Lab Today, you will use the Gravity Force Lab PhET Simulation to investigate what the gravitational force between two objects depends on and experimentally determine the Universal Gravitational constant, G. Answer the questions that follow after you have completed your analysis. Thinking Questions 1) What data will you need to collect to determine the value for "G"? Since the formula for force of gravity is F=G m1m2/r2 I will need to figure out the F, m1, m2, andr 2) How will you put this information into a data table that Excel can help you graph and find the best fit line? I will graph it 3) Write your procedure here "Remember a good procedure is a series of steps that someone else could executeĬonduct your investigation recording your data in Excel. You will develop your own procedure, collect data, graph your data, find a best fit line and interpret its slope to find G. Gravity acceleration is a vector quantity, with direction in addition to magnitude.Part 2 - Quantitative Measurements In this section of the lab, you will develop your own method for determining the gravitational constant G in the formula for gravity using the simulation and Excel. ![]() The gravitational effects of the Moon and the Sun (also the cause of the tides) have a very small effect on the apparent strength of Earth's gravity, depending on their relative positions typical variations are 2 µm/s 2 (0.2 mGal) over the course of a day.Ī plumb bob determines the local vertical direction The magnitude of the effect depends on the air density (and hence air pressure) or the water density respectively see Apparent weight for details. In air or water, objects experience a supporting buoyancy force which reduces the apparent strength of gravity (as measured by an object's weight). There is a strong correlation between the gravity derivation map of earth from NASA GRACE with positions of recent volcanic activity, ridge spreading and volcanos: these regions have a stronger gravitation than theoretical predictions. The areas where NASA GRACE measured gravity to be stronger than the theoretical gravity have a strong correlation with the positions of the volcanic activity and ridge spreading. The actual depth dependence of density and gravity, inferred from seismic travel times (see Adams–Williamson equation), is shown in the graphs below.Ī map of recent volcanic activity and ridge spreading. It is a vector quantity, whose direction coincides with a plumb bob and strength or magnitude is given by the norm g = ‖ g ‖ ![]() The gravity of Earth, denoted by g, is the net acceleration that is imparted to objects due to the combined effect of gravitation (from mass distribution within Earth) and the centrifugal force (from the Earth's rotation). Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker. Earth's gravity measured by NASA GRACE mission, showing deviations from the theoretical gravity of an idealized, smooth Earth, the so-called Earth ellipsoid. Use a simple pendulum to determine the acceleration due to gravityg g in your own locale. ![]()
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