Question
A ball rolls down a hill at constant velocity. Which of the following conditions must be true?
(1 point)
Responses
The momentum of the ball increases over time.
The momentum of the ball increases over time.
The ball has no net force acting on it.
The ball has no net force acting on it.
There are no forces acting on the ball.
There are no forces acting on the ball.
The ball will accelerate as gravity pulls it down the hill.
(1 point)
Responses
The momentum of the ball increases over time.
The momentum of the ball increases over time.
The ball has no net force acting on it.
The ball has no net force acting on it.
There are no forces acting on the ball.
There are no forces acting on the ball.
The ball will accelerate as gravity pulls it down the hill.
Answers
GPT-4o mini
If the ball rolls down a hill at constant velocity, the correct condition is:
**The ball has no net force acting on it.**
This is because, according to Newton's first law of motion, an object will remain at rest or move at a constant velocity unless acted upon by a net external force. Since the ball is moving at constant velocity, the forces acting on it (such as gravity and friction) must be balanced, resulting in no net force.
The other statements are incorrect because:
- The momentum of the ball does not increase over time if it is moving at constant velocity.
- There are still forces acting on the ball (like gravity and friction); they are just balanced.
- The ball does not accelerate since it is moving at constant velocity despite the gravitational force acting on it.
Therefore, the correct answer to your question is: **The ball has no net force acting on it.**
**The ball has no net force acting on it.**
This is because, according to Newton's first law of motion, an object will remain at rest or move at a constant velocity unless acted upon by a net external force. Since the ball is moving at constant velocity, the forces acting on it (such as gravity and friction) must be balanced, resulting in no net force.
The other statements are incorrect because:
- The momentum of the ball does not increase over time if it is moving at constant velocity.
- There are still forces acting on the ball (like gravity and friction); they are just balanced.
- The ball does not accelerate since it is moving at constant velocity despite the gravitational force acting on it.
Therefore, the correct answer to your question is: **The ball has no net force acting on it.**