Percent Error and Experimental Variables

The video tutorial by Isaac Berry from Mary Shine Slab explains percent error, a method to measure error in measurements using a percentage. It covers the concept of accepted and measured values, conducting trials with different shoe masses, graphing data, and determining the best fit line. The tutorial concludes with calculating percent error, emphasizing its importance in assessing measurement accuracy.

What is the primary purpose of calculating percent error?

• To find the exact value of a measurement

• To determine the accuracy of a measurement

• To compare two different measurements

• To eliminate human error in experiments

What is considered an acceptable percent error in measurements?

• Less than 5%

• Less than 15%

• Less than 10%

• Less than 1%

In the experiment, what is used to ensure no human error in the accepted value?

• A theoretical model

• A physical experiment

• A computer simulation

• A manual calculation

What variable is NOT provided in the trials of the experiment?

• Temperature

• Normal force

• Coefficient of friction

• Mass of the shoe

How many trials were conducted in the experiment?

• Two

• Three

• Four

• Five

What is plotted on the x-axis of the graph?

• Normal force

• Kinetic friction force

• Coefficient of friction

• Mass of the shoe

What is the slope of the best fit line in the graph?

• 0.85

• 0.90

• 0.95

• 1.00

How is the percent error calculated?

• By subtracting the accepted value from the measured value

• By adding the measured and accepted values and dividing by two

• By taking the absolute value of the difference between measured and accepted values, divided by the accepted value, times 100

• By dividing the measured value by the accepted value

What is the calculated percent error in the experiment?

• 4.5%

• 5.3%

• 6.1%

• 7.2%

Is the calculated percent error considered acceptable?

• No, it is above 5%

• No, it is above 10%

• Yes, it is below 5%

• Yes, it is exactly 5%