ScienceFreePrintable

Space Forces Simulation Experiment

A free science worksheet ready for your classroom. Open in Kuraplan to grab the print-ready PDF, customize it for your students, or generate a fresh version in seconds.

Download now

Name:Date:

Space Forces Simulation Experiment

Investigate how a satellite stays in orbit using a model and supplied data. A ball on a string is only an analogy: the string’s tension provides the inward force, while gravity provides the inward force for an Earth-orbiting satellite. Never swing an object indoors or near people. Use the data below if you cannot safely run the model.

Plan the investigation

A group models circular motion using a soft ball attached to a string. They change the string length and time 10 revolutions. Assume the ball’s mass and the way it is swung are kept as consistent as possible.

1.State a testable hypothesis predicting how changing the radius of the ball’s circular path could affect its period (time for one revolution). Give a reason based on circular motion.

2.Identify the independent variable, dependent variable, and two controlled variables for this investigation.

3.Choose the safest procedure for a classroom model.

Swing a hard ball quickly in a crowded room so its path is easy to see.
Use a soft ball in a clear, supervised area, check the attachment, and keep everyone beyond the path.
Tie the string loosely and stand close to the moving ball.

Analyse the mission data

A team records these results. The string length represents the radius. The measurements are illustrative model data, not measurements of real satellites.

Radius (cm)

Time for 10 revolutions (s)

Mean period (s per revolution)

8.0

Work it out

10.5

Work it out

12.8

Work it out

4.Calculate the mean period for each radius. Show the calculation for the 30 cm trial.

5.Describe the pattern between radius and mean period in these results. Does the data prove that radius alone caused the change? Explain briefly.

6.Calculate the ball’s average speed in the 30 cm trial. Use circumference = 2πr and period = 1.05 s. Give your answer in m/s to 2 significant figures.

Explain orbital forces

A satellite in a stable orbit is moving sideways while gravity continually changes the direction of its motion. It is not held up by a force that cancels gravity.

7.For a satellite orbiting Earth, which force points toward Earth’s centre, and what role does it play in keeping the satellite in orbit?

8.True or false: A satellite in orbit has no gravity acting on it.

TrueFalse

9.Explain one important difference between the ball-on-a-string model and a satellite orbiting Earth. Include what supplies the inward force in each case.

10.The model results may vary because a person cannot keep the ball’s speed perfectly constant. Suggest two improvements that would make the investigation more reliable or fair.