Which of the following describes an object with zero net force acting on it? Cho

Question

Which of the following describes an object with zero net force acting on it? Choose all that apply.

I want to believe that if an object is accelerating/decelerating or changing direction will have a net force on it, so the only one I see correct is the spaceship? But I'm not sure of the theory.

1. The moped accelerated while making a left turn.
2. The truck slowed down while making a right turn.
3. The motorcycle traveled at a constant speed while making a u-turn.
4. The spaceship traveled at a constant speed in a straight line.
5. The car sped up from 50 mph to 65 mph while moving in a straight line.

Explanation / Answer

4. The spaceship traveled at a constant speed in a straight line. constant speed=no acceleration and no acceleration= zero net force since F=ma

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