Question

using only these supplies, which question can farid investigate with an experiment? do toy cars go faster down the ramp made of wood or the ramp made of cardboard? does a big toy car go down the wooden ramp faster than a small toy car? do toy cars with plastic wheels go faster down the cardboard ramp than toy cars with metal wheels?

Explanation:

To determine which question Farid can investigate with an experiment, we analyze each option based on the idea of a controlled experiment (changing one variable while keeping others constant) and the implied "supplies" (likely a single type of ramp and toy cars, or at least the ability to test with the given supplies).

Analyzing Each Option:

1. "Do toy cars go faster down the ramp made of wood or the ramp made of cardboard?"

This compares two different ramp materials. If Farid has both a wooden ramp and a cardboard ramp (and toy cars), he can test this by releasing the same toy car (or identical cars) down each ramp and measuring speed. The variable is the ramp material, and other factors (car, release point, etc.) can be controlled.

1. "Does a big toy car go down the wooden ramp faster than a small toy car?"

This compares different - sized toy cars. However, "big" and "small" cars likely differ in mass, shape, or wheel design, introducing multiple variables (not just size). Controlling all other factors (like friction from wheels, aerodynamics) would be difficult, and the "supplies" likely do not specify having both big and small cars of identical design (except size).

1. "Do toy cars with plastic wheels go faster down the cardboard ramp than toy cars with metal wheels?"

This compares wheel materials. Similar to the size comparison, the cars with plastic vs. metal wheels likely differ in other ways (mass, design), and the "supplies" likely do not specify having cars with only wheel material as the difference.

Among the options, the first question (comparing ramp materials) is the most testable with a controlled experiment, as the only variable is the ramp material, and the toy car (and other conditions) can be kept constant.

Answer:

Do toy cars go faster down the ramp made of wood or the ramp made of cardboard?