Juan is riding in a roller coaster that is going downhill. Juan waves as he passes his friend Marta, who is standing on the ground. Which of the following is not moving with respect to Juan?
a. Marta
b. the trees around the roller coaster
c. the ground
d. the roller coaster
Since he sees everything wizzing past him (except the roller coaster that he is sitting in).
d.
To determine which of the options is not moving with respect to Juan, we need to understand the concept of relative motion. Relative motion refers to the observation of the motion of an object in relation to another object or frame of reference.
In this scenario, Juan is on the roller coaster, which is moving downhill. As he passes his friend Marta, who is standing on the ground, we need to consider the motion of the objects relative to Juan.
a. Marta: Since Marta is standing on the ground, she is not moving with respect to Juan. Therefore, option a (Marta) is moving with respect to Juan.
b. The trees around the roller coaster: As the roller coaster moves downhill, the trees around it also appear to be moving in the opposite direction. Therefore, option b (the trees around the roller coaster) is moving with respect to Juan.
c. The ground: Since Juan is on the roller coaster and moving downhill, the ground appears to be moving in the opposite direction. Therefore, option c (the ground) is moving with respect to Juan.
d. The roller coaster: Juan is on the roller coaster, so he and the roller coaster are moving together. Therefore, option d (the roller coaster) is not moving with respect to Juan.
Therefore, the correct answer is d. the roller coaster.