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A car speeds up.Which claim about the forces acting on the car must be true?Choose answer:(A) There is not enough information.(B) There is no net force on the car.(C) There is a net force on the car.(D) There are no forces on the car.
Full solution
Q. A car speeds up.Which claim about the forces acting on the car must be true?Choose answer:(A) There is not enough information.(B) There is no net force on the car.(C) There is a net force on the car.(D) There are no forces on the car.
- Car Acceleration Explanation: A car speeds up.To determine which claim about the forces acting on the car must be true, we can use Newton's second law of motion, which states that acceleration (a change in velocity, such as speeding up) is produced when a net force acts on a mass. If the car is speeding up, it means there is a change in velocity, indicating that there is an acceleration.
- Newton's Second Law Application: Since there is acceleration, according to Newton's second law , there must be a net force acting on the car to cause this acceleration. Therefore, the presence of a net force is necessary for the car to speed up.
- Evaluation of Options: We can now evaluate the options given:(A) There is not enough information. - This is incorrect because we know the car is speeding up, which implies information about the forces.(B) There is no net force on the car. - This is incorrect because if there were no net force, the car would not be accelerating (speeding up).(C) There is a net force on the car. - This is correct because the car's acceleration indicates a net force.(D) There are no forces on the car. - This is incorrect because if there were no forces, the car would not be moving at all, let alone speeding up.
