Question

1. choose the word that best completes the sentence.______ energy is the energy an object has because of its position and motion.a. lightb. magneticc. thermald. mechanical2. look at the picture. a student builds a model of a roller coaster to investigate the motion of the roller coaster car.the roller coaster car should roll down the hill, up and over the hump, and roll to the finish. when the student releases the roller coaster car, it rolls down the hill and just makes it to the top of the hump but stops before reaching the finish.which statement describes why the roller coaster car did not reach the finish?a. the roller coaster car did not have enough mechanical energy.b. the roller coaster car had too much mechanical energy.c. the roller coaster car had too much thermal energy.d. the roller coaster car did not have enough thermal energy.

Explanation:

In a roller - coaster system, mechanical energy (the sum of potential and kinetic energy) is involved in the motion. Thermal energy is related to heat. When the roller - coaster car doesn't reach the finish, it's because some of the mechanical energy is converted into thermal energy (due to friction, for example). If there is too much thermal energy (energy loss as heat), the remaining mechanical energy is not enough to complete the motion.

Answer:

B. The roller coaster car had too much thermal energy.