1. A study was done to find if different tire treads affect the braking distance of an Army Jeep. The same road surface was used each time.
Independent variable: Tire Treads
Dependent Variable: Braking Distance
2. An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same kind of coffee, the same percolator, the same amount and type of water, and the same perking time were used for each test. In the first test, no coffee grounds were used.
Independent Variable: Amount of coffee grounds
Dependent Variable: The taste of coffee
A study was done with an electromagnet system made from a battery and wire wrapped around a nail. Different sizes of nails were used and the number of paper clips that the electromagnet could pick up was measured.
Independent variable: Sizes of nails
Dependent variable: number of paper clips picked up
A study was attempted to find if the length of the string in a string telephone affected its sound clarity. The same type of string was used each time and the studies were all conducted at the same temperature.
Independent variable: Same type of string
Dependent variable: sound clarity
The time it takes to run a mile depends on the person's running speed.
length of string ?
Independent variable: Length of the string in the string telephone
Dependent variable: Sound clarity
Independent variable: Length of the string in the string telephone
Dependent variable: Sound clarity