Answered

A student wants to know if the weight of a cart affects its speed at the bottom of a ramp. He can change the weight of the cart by adding different numbers of balls, and he can change the height of the ramp by using different numbers of blocks. Which set of tests should he compare set a,b,c or d ?



Answer :

Explanation:

To determine if the weight of a cart affects its speed at the bottom of a ramp, the student can conduct a set of tests by comparing different scenarios. Let's analyze each set:

Set A: Varying the weight of the cart (number of balls) while keeping the height of the ramp constant.

- This set of tests will help determine the relationship between the weight of the cart and its speed on a ramp. By adding different numbers of balls to the cart and keeping the height of the ramp constant, the student can observe if there is a noticeable difference in the cart's speed at the bottom of the ramp.

Set B: Varying the height of the ramp (number of blocks) while keeping the weight of the cart constant.

- This set of tests will help determine the relationship between the height of the ramp and the cart's speed. By using different numbers of blocks to adjust the height of the ramp while keeping the weight of the cart constant, the student can observe if there is a correlation between the ramp's height and the cart's speed at the bottom.

Set C: Varying both the weight of the cart (number of balls) and the height of the ramp (number of blocks).

- This set of tests will allow the student to investigate the combined effect of both the weight of the cart and the height of the ramp on the cart's speed. By changing the weight of the cart and the height of the ramp simultaneously, the student can observe if there are any interactions or dependencies between these variables.

Set D: Keeping the weight of the cart and the height of the ramp constant.

- This set of tests serves as a control group, where the student maintains a constant weight for the cart and a constant height for the ramp. By conducting tests under these constant conditions, the student can compare the results with the other sets to determine if any observed differences in speed are due to changes in weight or height.

To comprehensively investigate the question, the student should compare all sets (A, B, C, and D) to gather a complete understanding of how weight and height impact the cart's speed at the bottom of the ramp.