Yo, GPE
Do you hear what I hear?
More passion, more energy
Warning! Error!
Graphing out loud
100
What is the formula for GPE?
GPE = mass x gravitational acceleration x height
100
What is the speed of sound?
344m/s
100
What is the law of conservation of energy?
Energy cannot be created or destroyed, only transferred or converted into different forms.
100
What does percentage error tell us?
How close an experimental result is to the accepted or true value.
100
What is a phrase you can use to describe a positive relationship?
As Variable 1 increases, Variable 2 increases.
200
What unit is GPE measured in?
J or Joules
200
What is the formula to calculate speed?
Speed = Distance / Time
200
What type of energy does the ball convert to when released?
Kinetic energy
200
What is the formula for percentage error?
Percentage error = [(true value-measured value)/true value] x100
200
What is a phrase you can use to describe a positive relationship?
As Variable 1 increases, Variable 2 decreases.
300
Explain what happens to the GPE of an object as the initial height increases.
As the height of the object increases, GPE also increases as seen in equation GPE = mxgxh.
300
What are the units for distance and time?
Distance = metres
Time = seconds
300
What waste energy is released when the ball bounces?
Heat and sound energy
300
True value of speed of sound = 344m/s
Measured speed = 331.35m/s
Calculate the percentage error.
Percentage error = [(344-331.35)/344] x100 = 3.68%
300
When describing a trend in a graph, you must include what two things?
1. State the 2 variables
2. Describe the relationship
400
Calculate the GPE of a 0.5kg volleyball at 2m initial height.
GPE = 0.5kg x 9.81m/s x 2m = 9.81J
400
If sound travels 500m in 1.5s, what is the speed?
Speed = 500/1.5 = 333.33m/s
400
Explain how even though there is waste energy when the ball bounces, it still supports the law of conservation of energy.
When the ball bounces, waste energy is produced in the form of sound and heat. The energy is not destroyed when the ball loses height; rather, it is transformed into other forms of energy.
400
Name 3 errors that occurred during the sound experiment that affect the accuracy of the results.
Human reaction time
Wind or air movement
Distance measurement inaccuracies
Echoes or background noise
Temperature differences
400
Describe the trend in the below graph.
The graph shows a positive trend where the grades increase as time increases.
500
Calculate the GPE of a 750g bottle that is being held at 5m.
GPE = 0.75kg x 9.81m/s x 5m = 36.79J
500
In the experiment, Person 1 was standing 200m away from Person 2. Person 1 clapped and Person 2 heard the clap after 0.65s. Calculate the speed.
Speed = 200m/0.65s = 307.7 m/s
500
Explain all the different types of energy acting upon the ball during the experiment.
At initial height - GPE
Falling - kinetic energy
Hits ground - heat, sound, elastic energy
Bounces - kinetic energy
At bounce height - GPE
500
Calculate the percentage error using the average of the following results:
Trial 1 - 330 m/s
Trial 2 - 320m/s
Trial 3 - 310 m/s
Average = 320m/s
Percentage error = [(344-320)/344)]x100 = 6.97%
500
To figure out what the graph is telling you, where is the best place to get the information?
Graph title, axis titles, trendline and data points.