Work and Energy Test

Result

Work and Energy Test - 13

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Question 1
1 / -0

Use the following information to answer the next question.

A car is moving on a horizontal road. Initially, it was at rest. The speed of the car gradually increases.

It can be said that the

A
kinetic energy of the car increases

B
kinetic energy of the car decreases

C
potential energy of the car increases

D
potential energy of the car decreases

Solution

The kinetic energy of the car is directly proportional to its speed. The speed of the car gradually increases. Hence, it can be said that the kinetic energy of the car increases.

The correct answer is A.

Why alternative B is wrong:

The kinetic energy of the car is directly proportional to its speed. Therefore, its kinetic energy would decrease with a decrease in its speed.

Why alternative C is wrong:

The potential energy of an object is directly proportional to its height and position above the ground. Since the car is moving on a horizontal road, its potential energy is constant.

Why alternative D is wrong:

The potential energy of an object is directly proportional to its height and position above the ground. Since the car is moving on a horizontal road, its potential energy is constant.