Gravity Lab Introduction KEY - Weebly

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Gravity Lab Introduction KEY

Score:____/67

1. Go to 2. Select RUN

Qualitative Observations

(7 points)

1. Move the masses closer. When they move closer the force between them becomes

_________________________ (Greater/Less/the same)

2. Move the masses further apart. When the masses move away the force between them becomes

_________________________ (Greater/Less/the same)

3. Double Mass 1. When mass 1 is doubled the force between them becomes

_________________________ (Greater/Less/the same)

4. Cut Mass 2 in half. When the mass is reduced the force between them becomes

_________________________ (Greater/Less/the same)

5. In any of the situations did the forces ever differ in magnitude?

No. the forces always have the same magnitude, but the opposite direction

6. In any of the situations did the forces ever not point in opposing directions?

No. they always point in the opposite direction

7. What physics LAW explains questions 5 and 6 (either give name or definition)

Newton's Third Law ? action-reaction forces

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Quantitative Observations

MASS

It is now time to build a model. First, let us examine the relationship between masses.

a) Separate Mass 1 and Mass 2 so that their centers of mass (black dots) are 6 meters apart.

b) Set Mass 2 to 30.0 kg.

c) Start Mass 1 at zero kg. Collect 10 data points with the gravitational force being your dependent variable

and your Mass 1 being an independent variable. Create a data table in the space below.

(5 points)

Force of gravity (N)

0 5.50 x10-10 1.10 x 10-9 1.66x 10-9 2.21 x 10-9 2.76 x 10-9 3.31 x 10-9 3.87 x 10-9 4.42 x 10-9 4.97 x 10-9 5.52 x 10-9

M1 (kg) 0 10 20 30 40 50 60 70 80 90

100

M2 (kg) 30 30 30 30 30 30 30 30 30 30 30

d) Sketch a graph Force of Gravity vs. Mass 1 either by hand or by using MS Excel.

(5 points)

Fg (N)

Mass 1 (kg)

2

e) Re ? do the experiment but set Mass 1 to 30.0 kg and collect data on Mass 2's relationship to force. Create

a data table in the space below.

(5 points)

Force of gravity (N)

0 5.50 x10-10 1.10 x 10-9 1.66x 10-9 2.21 x 10-9 2.76 x 10-9 3.31 x 10-9 3.87 x 10-9 4.42 x 10-9 4.97 x 10-9 5.52 x 10-9

M2 (kg) 0 10 20 30 40 50 60 70 80 90

100

M1 (kg) 30 30 30 30 30 30 30 30 30 30 30

f) Sketch a graph Force of Gravity vs Mass 2 either by hand or by using MS Excel.

(5 points)

Fg (N)

Mass 2 (kg)

8. Does it matter which mass increases? Explain!

(2 points)

No, it doesn't. The gravitational force is the same no matter which mass is decresed/increased

9. What type of relationship is there between Mass and force?

(2 points)

There is direct proportion between Gravitational Force and mass. When one of the quantities increases, the

other one increases; if one of them decreases, the other one decreases as well.

It's a linear relationship.

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DISTANCE

a) Set both masses to 30.0 kg.

b) Collect 10 data points of different distances between the masses. Hint: you can move the ruler and the masses to maximize your range. Create a data table in the space below.

Force of gravity (N) 6.00 x10-10 7.40 x 10-10 9.40 x 10-10 1.22 x 10-9 1.66 x 10-9 2.41 x 10-9 3.77 x 10-9 6.63 x 10-9 5.16 x 10-9 8.83 x 10-9

Distance (m) 10 9 8 7 6 5 4 3 3.4 2.6

M2 (kg) 30 30 30 30 30 30 30 30 30 30

M1 (kg) 30 30 30 30 30 30 30 30 30 30

(5 points)

c) Sketch a graph of Force of Gravity vs. Distance (F vs. r) by hand or by using MS Excel. (5 points)

Fg (N)

Distance (m)

10. What is the relationship between distance and the force of gravity?

(2 points)

There are inversely proportional to each other. When one of the quantities increases, the other one

decreases; if one of them decreases, the other one increases as well.

It's an inverse relationship (inverse power law).

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d) Linearize the graph. Create a data table in the space below and sketch it using MS Excel or by hand. Be

careful!

(5 points)

Force of gravity (N) 6.00 x10-10 7.40 x 10-10 9.40 x 10-10 1.22 x 10-9 1.66 x 10-9 2.41 x 10-9 3.77 x 10-9 6.63 x 10-9 5.16 x 10-9 8.83 x 10-9

Distance (m) 10 9 8 7 6 5 4 3 3.4 2.6

Distance-1 (m-1) 0.100 0.110 0.125 0.143 0.167 0.200 0.250 0.333 0.294 0.385

Distance-2 (m-2) 0.0100 0.0123 0.0156 0.0204 0.0278 0.0400 0.0625 0.1111 0.0865 0.148

Distance-3 (m-3) 0.00100 0.00137 0.00195 0.00292 0.00463 0.00800 0.0156 0.0370 0.0254 0.0569

Force of Gravity vs Distance-1

Force of Gravity vs Distance-2

Force of Gravity vs Distance-3

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