Question

an object is accelerating. which one of the following statements is true?
the object must be speeding up.
the object must be changing directions.
there is a net force acting on the object.
the object must be slowing down.

1. -/1 points

a ball is being twirled in a circle. if the string breaks and we ignore gravity, what path will the ball follow after the string breaks?
it will continue moving at the same speed in a straight line.
it will slow down and move in a circle.
it will continue moving at the same speed in a circle.
it will speed up and move in a circle.
it will slow down and move in a straight line.
it will fall to the ground due to gravity.

Explanation:

Step1: Analyze the first question

According to Newton's second law \(F = ma\), if an object is accelerating (\(a
eq0\)), then there must be a net force (\(F
eq0\)) acting on it. An object can accelerate by speeding up, slowing down, or changing direction. So the first and second and fourth options are wrong.

Step2: Analyze the second question

According to Newton's first law (law of inertia), when the string breaks and gravity is ignored, there is no net force acting on the ball. So it will continue to move at a constant speed in a straight - line path (the direction of the velocity at the moment the string breaks).

Answer:

For the first question: The correct statement is “There is a net force acting on the object.”
For the second question: The correct statement is “It will continue moving at the same speed in a straight line.”