# MOTION UNDER GRAVITY - VERTICAL MOTION ANIMATION SOFTWARE

### MOTION UNDER GRAVITY - Vertical motion softwareFeatures:

The Motion Under gravity - Vertical motion is a physics software, which facilitates to solve physics problems related to law of linear motion applied to vertical motions and to visualise that motion with an example of a ball movement as a real time animation. The software plots the following real time graph pertaining to the solved vertical motion.

• Displacement Vs Time graph

• Velocity Vs Time graph

• Acceleration Vs Time graph

Also the software traces along the graph while the ball is moving. The users are given the choice to select from many different unit systems for solving, visualising and plotting the graph. Also users can straightaway select any planet for simulating the acceleration due to gravity of that planet.

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• Open Genius Maker software and click "Motion under Gravity" button. It opens the Motion under gravity window as shown above.

CONVENTION

• The sign convention followed in this software is as follows
• The downward direction is Positive.
• The upward direction is Negative.
• Hence,
• the acceleration due to gravity of any planet should be given as a positive value.
• the displacement from an upper point to a lower point will be positive.
• the velocity of objects moving downwards will be positive
• Similarly,
• the upward acceleration will be represented as a negative value.
• the displacement from a lower point to an upper point will be negative.
• the velocity of objects moving upwards will be negative
• Let us learn to use the software with the following examples

EXAMPLE - 1

• A ball is thrown vertically from the surface of moon with a velocity of 15 m/s. Calculate the velocity of the ball and time taken reach back to the surface.
• Cilck "Clear data" button to clear off any existing data.

• Ensure that the unit system selected is " Meter - Second ". If not, select it by using the drop down menu of "Change to another unit system".

• Ensure that the place selected is "Moon". If not, select it by using the drop down menu of "Select a place".

• Enter the following values in the respective boxes.

• Initial velocity, U = -15 m/s ( It is negative, because it is moving upwards )

• Acceleration, A = 1.62 m/s2  ( This value is automatically displayed by the software, since you have selected the place as moon.)

• Displacement, S = 0 m

• Click "Solve" button

• You may see the following.

• The software solves the given problem and finds out the values of Final velocity and Time as 15 m/s & 18.5185 s respectively and displays the same in the relevant boxes.

• The graph window shows all the graphs pertaining to the currently solved vertical motion.

• Try selecting different options from "Select a graph" window. You will see that the graph window changes accordingly.

• Now click "PLAY" button.

• You may see that the ball starts moving as per the currently solved vertical motion and the graph window starts tracing along the graphs showing the current state of the ball at any moment. The output parameters window displays the current values of Time, Displacement and velocity as the motion progresses.

• You may now click "PAUSE" button and see that the play is paused and the graph window also stops tracing and it becomes still at that point of time. The output parameters window also becomes standstill. The caption of the "Pause" button changes to "RESUME".

• Click "Resume" button.

• The play resumes from the previous position and the graph also resumes tracing.

• If you want to stop the play at any moment, click "STOP" button. The play stops.

• You may play it for any number of times.

EXAMPLE - 2

• A stone is dropped from a height of 100 feet from the surface of the planet Pluto. What is the time required for the stone to reach the surface ? At what velocity it will reach the surface ?
• Cilck "Clear data" button to clear off any existing data.

• Select the unit system as " Foot - Second " by using the drop down menu of "Change to another unit system".

• Ensure that the place selected is "Moon ". If not, select it by using the drop down menu of "Select a place".

• Select the place as " Pluto " by using the drop down menu of "Select a place".

• Enter the following values in the respective boxes.

• Initial velocity, U = 0 ft/s ( Since it is just dropped.)

• Acceleration, A = 13.1234 m/s2  ( This value is automatically displayed by the software, since you have selected the place as pluto.)

• Displacement, S = 100 ft

• Click "Solve" button

• You may see the following.

• The software solves the given problem and finds out the values of Final velocity and Time of travel as 162.0086 ft/s & 12.345 s respectively and displays the same in the relevant boxes.

• The graph window shows all the graphs pertaining to the currently solved vertical motion.

• Try selecting different options from "Select a graph" window. You will see that the graph window changes accordingly.

• Now click "PLAY" button.

• You may see that the ball starts moving as per the currently solved vertical motion and the graph window starts tracing along the graphs showing the current state of the ball at any moment. The output parameters window displays the current values of Time, Displacement and velocity as the motion progresses.

• You may now click "PAUSE" button and see that the play is paused and the graph window also stops tracing and it becomes still at that point of time. The output parameters window also becomes standstill. The caption of the "Pause" button changes to "RESUME".

• Click "Resume" button.

• The play resumes from the previous position and the graph also resumes tracing.

• If you want to stop the play at any moment, click "STOP" button. The play stops.

• You may play it for any number of times.

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