Few Conceptual questions regarding Rotational Motion.

Instead, they are in static contact, which means there is no relative motion between them. This is why kinetic friction does no work in a rolling object. Additionally, in a situation where a solid bowling ball rolls without slipping down a ramp, the ball's acceleration can be calculated using the angle of the ramp and the ball's mass and moment of inertia. The friction force on the ball in this scenario is static and directed uphill, as stated in the book. This may seem counterintuitive, but it can be explained by considering the direction of the normal force and the force of gravity acting on the ball.
  • #1
NJDevilsFan26
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Listed below are just a things I cannot figure out involving rotational motion (one involves a situation).

-Why does Kinetic Friction do no work if bodies roll without slipping? I thought it would add torque to provide more energy for rotational motion.

Situation: A solid bowling ball rolls without slipping down the return ramp at the side of the alley. The ramp is inclined at an angle beta to the horizontal. What are the ball's acceleration and the magnitude of the friction force on the ball? Treat the ball as a uniform solid sphere, ignoring the finger holes.

- I obtained the correct results for this problem, but I do not understand why the friction is static. Also, the book is saying that if the ball were rolling uphill, the force of friction would still be directed uphill, which I do not understand as well.

I appreciate any helpful comments regarding these problems.
 
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Welcome to PF.

Kinetic friction refers to friction between two surfaces that are sliding past each other. In a rolling object, the surfaces aren't sliding past each other.
 

1. What is rotational motion?

Rotational motion is the movement of an object around its own axis or a fixed point. This type of motion is commonly observed in circular or spinning objects.

2. What is the difference between rotational motion and translational motion?

Translational motion is the movement of an object from one point to another in a straight line, while rotational motion involves the object rotating or spinning around a fixed point.

3. What is angular velocity?

Angular velocity is the rate of change of an object's angular displacement over time. It is measured in radians per second (rad/s).

4. How is torque related to rotational motion?

Torque is a force that causes an object to rotate around an axis. It is directly proportional to the angular acceleration of the object and the distance from the axis of rotation to the point where the force is applied.

5. Can rotational motion be described using Newton's Laws of Motion?

Yes, rotational motion can be described using Newton's Laws of Motion. The first law states that an object in motion will remain in motion unless acted upon by an external force, which applies to rotational motion as well. The second law relates the torque applied to an object with its angular acceleration, and the third law states that for every action, there is an equal and opposite reaction, which applies to rotational motion as well.

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