# Investigate free-falling objects and projectile motions.

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Introduction

## Experiments to investigate free-falling objects and projectile motions

By Sinthiya Punnialingam

Aim:

The aim of my experiment is to obtain results/ data and see whether a pattern can be distinguished or whether my data agrees with a theory or law. I’m going to try to undergo two investigations using the same apparatus, and look at the outcome of my results and see whether a firm conclusion can be made.

For the two investigations, I’m going to look at free-falling objects and projectile motions:

Investigation 1:

Isaac Newton firstly discovered gravity when an apple fell on his head. He then discovered that every object has a mass and that two masses attract each other. This attraction has a gravitational field strength, Newton wanted to calculate the gravitational field strength of the earth. Newton discovered that when a force is

Middle

Using the idea of vectors, velocity, force, acceleration has a vertical and a horizontal component in order for the object to have a direction. In this case, the car goes down the slope because a force is working on it. The force down the slope, has a vertical component and a horizontal component. On all objects, a gravitional force is pulling objects down , therefore any object has a weight:

Gravitaional force: weight: mass * gravity

To find the components we could attach the horizontal and vertical vectors on to ‘mg’, which forms a right-angle triangle. Unfortunately we can’t use pythagorus theorem because we don’t know the size of each component, even though I know that the mass of the car is o.o655kg, I want to see if I could produce a calculation which will apply

Conclusion

ma = mg * sin 0 (take mass from both sides0

a=g*sin0 (sin 0 would be a constant)

Therefore, knowing that the angle of eleveation is 7.6:

Acceleration = 9.8 8 sin 7.6

= 1.30 m/s/s

Therefore if the rule of free-falling object was applied to this experiment, acceleration must be 1.30 m/s/s. To see if it does, I’m going to attach a ticker tape to the car and let it go at that angle of elevation, and see whether I get this result.

On a ticker tape, the time to make two dots in 1/50 second, so I’m going to measure the distance between 10 dots, so I’m measuring the displacement every 0.5 s:Using this graph, I can find velocity by finding the gradient of this graph line:

Velocity= displacement/ time = horizontal/vertical =

To find acceleration, we have to find the change in velocity/ time taken, to do this, I could plot a velocity-time graph:

To find acceleration, I need to find the gradient of this graph line.

This student written piece of work is one of many that can be found in our AS and A Level Mechanics & Radioactivity section.

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