What Causes a Sphere to Rotate on a Ramp with Negligible Friction?

In summary, rotational movement is when an object rotates or spins around a fixed point or axis. Torque is a measure of the rotational force applied to an object, calculated by multiplying the force applied by the distance from the axis of rotation. Torque and rotational motion are directly related, with greater torque resulting in greater rotational acceleration. Torque differs from force in its direction and application, with force being linear and torque being rotational.
  • #1
Kiwiro0ls
12
0
If I have a sphere at rest on top of a ramp, if friccion is negligible, the only forces acting on it would be gravity and the normal force. Both of these go through it's axis of rotation which would be the spheres center. What would cause the rotation then so τ≠0?
 
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  • #2
Kiwiro0ls said:
What would cause the rotation then so τ≠0?
What makes you think it would rotate?
 
  • #3
I guess there's no rotation at all unless there's friccion? boo...
 
  • #4
Right. Without friction, the sphere will just slide.
 
  • #5


The rotation of the sphere in this scenario would be caused by a net torque acting on it. While the forces of gravity and normal force may go through the sphere's axis of rotation, they may not necessarily be equal in magnitude and opposite in direction. This would result in a net torque, causing the sphere to rotate. Additionally, the distribution of mass within the sphere could also play a role in generating a net torque. In cases where friction is negligible, the sphere may also have a tendency to roll down the ramp due to its shape and the force of gravity acting on it. Overall, it is important to consider all forces and factors at play in order to fully understand the rotational movement of the sphere.
 

1. What is rotational movement?

Rotational movement, also known as angular motion, is the movement of an object around a fixed point or axis. It involves the object rotating or spinning in a circular motion.

2. What is torque?

Torque is a measure of the rotational force applied to an object. It is the product of the force and the distance from the axis of rotation to the point where the force is applied.

3. How is torque calculated?

Torque (𝝉) is calculated by multiplying the force (F) applied to an object by the distance (r) from the axis of rotation to the point where the force is applied. Mathematically, 𝝉 = F x r.

4. What is the relationship between torque and rotational motion?

Torque is directly related to the rotational motion of an object. The greater the torque applied to an object, the greater the rotational acceleration it will experience.

5. How is torque different from force?

Force and torque are both measures of a physical interaction, but they differ in their direction and application. Force is a linear measure, while torque is a rotational measure. Additionally, force is applied in a straight line, whereas torque is applied in a circular motion around an axis.

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