Predicting Changes in Kinetic Energy Quick Check
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Question
A large truck and a small car are moving at the same speed, traveling up and down hills, and over bumpy roads. Which one has more kinetic energy?(1 point)
Responses
The truck has less kinetic energy because it has greater mass.
The truck has less kinetic energy because it has greater mass.
The car has more kinetic energy because it moves fast down hills.
The car has more kinetic energy because it moves fast down hills.
The truck has more kinetic energy because it has a greater mass.
The truck has more kinetic energy because it has a greater mass.
The car and truck have the same kinetic energy.
The car and truck have the same kinetic energy.
The correct response is: The truck has more kinetic energy because it has a greater mass.
The correct answer is "The truck has more kinetic energy because it has a greater mass."
To understand why this is the correct answer, let's first define kinetic energy. Kinetic energy is the energy an object possesses due to its motion. It depends on both the mass and the speed of the object. The formula for kinetic energy is KE = 1/2 * m * v^2, where KE is the kinetic energy, m is the mass, and v is the velocity (speed).
In this scenario, we are told that the truck and the small car are moving at the same speed. However, the truck has a greater mass compared to the small car. According to the formula for kinetic energy, since the velocity is the same for both vehicles but the mass of the truck is greater, the truck will have more kinetic energy.
Therefore, the correct response is "The truck has more kinetic energy because it has a greater mass."