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PHYSICS:TROLLEY

Extracts from this document...

Introduction

In this investigation I am finding out how the height of a ramp
affects the speed of a toy car.
 

To do this, I first need to know about speed and gravity.

I know the equation for speed is: Speed =
 Distance 
                                                                  time

From that equation I can now work out what the speed of the toy car
will be, when I know the distance the ramp is and the time it took the
car to come down the ramp.

There is a force in the Earth that
attracts all objects to it; this was discovered by Isaac Newton so that we don’t float in the air. Depending on how high an object is away from the ground, the
gravity will be higher in the object, but the gravity on the Earth is
always the same.

Equation for gravity: Mass of object x 10 x height

Variables

There is only one variable in this experiment and that is:

· The height of the ramp

Fair Test

To make it a fair test you must:

· Use the same toy car so the weight stays the same

· use a QED to take down times

· Apply the same force, push the car with the same power
· Use same ramp and have same distance and same surface of ramp

Prediction

I predict that the higher the ramp, the faster the toy car will go. I

...read more.

Middle


it is too fast and it won’t be precise. If it was too low, the car
might not start running and you might have to push it so it wouldn’t
be a fair test.

Obtaining Evidence: Results 

Height (centimetres)

Distance (centimetres)

Time 1st (seconds)

Time 2nd (seconds)

Average Speed

speed=
distance

      time


(cm/s)

5

100

2.46

2.32

41.84= 42

10

100

1.40

1.27

74.91=75

15

100

1.26

1.01

88.11=88

20

100

0.98

1.04

99.01=99

25

100

0.80

1.09

105.82=106

30

100

0.66

0.52

169.49=169

35

100

0.68

0.66

149.25=149

40

100

0.78

0.80

126.58=127

45

100

0.54

0.59

176.99=177

50

100

0.51

0.53

192.31=192

Anomalous results repeated

Height (centimetres)

Distance (centimetres)

Time 1st (seconds)

Time 2nd (seconds)

Average Speed

speed =
distance
            time

(cm/s)

30

100

0.79

0.78

127.39=127

40

100

0.67

0.64

152.67=153

Analysing and considering Evidence

Graph 1 

Graph 1 shows the first results recorded in the table of results
above, as a line graph.

You can see that there are two anomalous results in this graph, which
were then repeated and are shown in Graph 2.

In this graph you can see more or less what the relationship between
the height of a ramp and the speed of a car is.

from these results I learnt that the higher the ramp = the faster the speed of the toy car

The graph shows two anomalies, but in graph two, these anomalies are
then corrected by repeating the experiment. This shows that the
anomalies aren’t part of what the results should show, but it was a
problem of us doing the experiment. It could be that we measured the
time wrong either started or ended too early or too late or that we

...read more.

Conclusion



From this I think that it isn’t very reliable, as the anomalies
changed very easily, the same way in which they could have changed to
not fitting into a pattern again. But, the experiment is reliable
enough to support the conclusion that the higher the height the faster
the speed, because it worked like that most of the time. My conclusion
is reliable enough to show to other people and trust it is right and
that that is the way it will always work.

Further work that could be done to provide additional relevant
evidence could be to do the same thing with a longer ramp and increase
the height up to the point when the ramp was a straight line, so that
would be the maximum speed. You could also change the surface of the
ramp to see which surface made it go faster, or do it in different
places, where it is windy, or sunny, or cold, hot the wind blowing
east, west south or north. The car could have different weights
and you could look at which one went faster, the heavier one or the
lighter one. But then you risk making the experiment un reliable as you cannot control things like weather.

But overall I believe this experiment was a success as I accomplished everything I set out to do and I believe I made the test itself as fair as humanly possible. So I am extremely pleased with my overview of this investigation.

BY JACK CUBITT 5K

...read more.

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