Question

Fan & Medal to all helpful answers :D

A student is investigating how the extension of a spring varies when she changes the force stretching it.

She writes the following design for her experiment
> I will hang 100g on the spring
> I will hold a ruler next to the spring
> I will add another mass and measure the length again
>I will repeat the process until I have enough measurements

What is the students' dependent variable?
Suggest one important control variable that she should keep the same?

Thank you in advance :D

Answer 1

Dependent variable is something that changes when you change something else (the independent variable).
Here your independent variable is the mass attached and the dependent variable is the extension of the spring.
Control variable is something you will keep constant so that the result of your experiment is unaffected.

Answer 2

She keeps the same spring.

Answer 3

Students dependent variable is mass... because of mass gravitational force acts.

Answer 4

F = mg greater the mass.. greater the force.

Answer 5

Another variable is the length of spring.. thats dependent variable.. force increase then length of spring also increases.

Answer 6

she is changing the mass. length is also changing.. from hook's law... F = kx.. where "k" is the constant and "x" is the extension in length... so appling force is directly proportional to the "x".

Answer 7

@emcrazy14 Thank you ever so much for your help, I really appreciate it :D
@IhteshamMalik Jazakallah Khayr! That was really helpful!!