Question

pedro is conducting an experiment to determine the force due to friction exerted on a small block of wood sliding down a ramp. he completes one trial and finds the force due to friction is 5 newtons (n). later in the day, he completes two more trials using the same experimental setup and determines the force due to friction for the two numbers and concludes that the force due to friction is 3.5 newtons. what should pedro do next to improve the credibility of his conclusion?

• pedro needs to change the incline of the ramp.
• pedro needs to change his mathematical formula.
• pedro needs to use better equipment to conduct the experiment.
• pedro needs to ask another student to conduct the same experiment.

Explanation:

To improve the credibility of experimental conclusions, increasing the number of trials or verifying results through independent replication helps reduce random error and confirm consistency. Having another student conduct the same experiment with the same setup checks if the results are reproducible, which strengthens the conclusion's reliability. Changing the ramp incline or formula would alter the experimental conditions or analysis incorrectly, and better equipment isn't indicated as an issue here since the problem doesn't mention equipment error.

Answer:

Pedro needs to ask another student to conduct the same experiment.