The Small Vehicle on Rails: What Drives It?
The small vehicle rides on rails and is driven.
A) By a motor
B) By gravity
C) Independently
D) Requires additional information
Final answer:
The question about what drives a small vehicle on rails cannot be answered definitively without additional information. Principles of kinetic and potential energy would be relevant to this context, contributing to the movement of the vehicle depending on how it is powered.
This correct answer is B)
Explanation:
Whether a small vehicle riding on rails is driven by a motor, by gravity, independently or if it requires additional information cannot be determined from the question alone.
However, it's worth understanding the principles at play should additional information be provided. If a vehicle on rails is driven by a motor, it relies on kinetic energy provided by the motor to overcome friction and other resistive forces.
Meanwhile, vehicles such as rollercoasters that rely on gravity for motion use potential energy stored due to their elevation, which gets converted to kinetic energy as they descend.
Examples of situations involving kinetic and potential energy include a person standing up from a seated position, which involves converting potential energy into kinetic energy to lift the body against gravity. Similarly, a car accelerating while driving is increasing its kinetic energy through the work done by the engine.
Other examples are a car rounding a bend at a constant speed, a merry-go-round increasing from rest to a constant rotational speed, and a pendulum swinging back and forth, all of these involve changes between potential and kinetic energy.
This correct answer is B)