A car travels rightwards with increasing velocity on a horizontal surface. Which of the following options about the direction of the acceleration, the direction of the net force, k... A car travels rightwards with increasing velocity on a horizontal surface. Which of the following options about the direction of the acceleration, the direction of the net force, kinetic energy of the car, and the sign of the net work done by external forces is correct for the situation described above?
Understand the Problem
The question is asking for the correct combination of the direction of acceleration, net force, kinetic energy of the car, and net work done by external forces for a car moving to the right with increasing velocity on a horizontal surface.
Answer
B
The direction of acceleration is right, the direction of net force is right, kinetic energy is increasing, and net work done by external forces is positive.
Answer for screen readers
The direction of acceleration is right, the direction of net force is right, kinetic energy is increasing, and net work done by external forces is positive.
More Information
The car's increasing rightward velocity indicates both a rightward net force and rightward acceleration, leading to positive work done by external forces and increasing kinetic energy.
Tips
A common mistake is assuming the direction of forces or neglecting the relationship between work and energy.
Sources
- Newton's Laws Review - with Answers #4 - physicsclassroom.com
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