what is the cause of uniform circular motion???

Answer 1

centripetal force caused by the gravitational attraction between the two bodies and centrifugal force caused due to the kinetic energy of the rotating object are the causes....centripetal force attracts the body inwards and centrifugal force tends to fling the body away.....

Answer 2

The net force acting on a body will always change the velocity of a body.

Since velocity is a vector, it has both magnitude and direction.

Therefore a force acting on a body can change both the magnitude and direction of the velocity or it may change the magnitude alone or it may change the direction alone.

That depends upon the direction of force and the direction of the velocity.

When the force acts perpendicular to the velocity of a body, there is no component of force along the direction of velocity and hence there is no change in the magnitude of the velocity, but there is change in direction of the velocity.

Thus a force acting perpendicular the velocity will not change the magnitude but it will change the direction of motion.

If this perpendicular force acts always pointed to a fixed point then the body can execute circular motion with out change in the magnitude of the velocity.

Thus the cause for uniform circular motion is the constant velocity of the body as well as the constant force acting perpendicular the velocity and pointed toward a fixed point.

If either the velocity of the body changes or if the force changes then the body will not be in uniform circular motion.

Answer 3

Uniform circular motion is actually a specific type of motion. An object is undergoing uniform circular motion if it is traveling at a constant speed while moving in a circle. For example, if you drive a car around a circle while maintaining a constant speed, you are performing uniform circular motion. If it makes you feel better, you could even wear a uniform while driving. The main requirements for uniform circular motion are a constant speed and motion in a circle. The object has to move in a circle and not some other shape. If the object is moving at a constant speed but is not moving in a circle, then it is not uniform circular motion

Answer 4

The realm of physics consists of two types of circular motion: uniform circular motion and non-uniform circular motion.

Uniform circular motion describes motion in which an object moves with constant speed along a circular path.


Acceleration and velocity
Since the velocity is tangent to the circular path, no two velocities point in the same direction. Although the object has a constant speed, its direction is always changing. This change in velocity causes the object to accelerate. Similar to the velocity, the acceleration’s magnitude is held constant and the direction is forever changing. Such an object experiences a constantly changing acceleration pointing radially inwards (centripetally), which is perpendicular to its velocity. This acceleration is known as centripetal acceleration.

The magnitude of the acceleration is given by a = v2 / r, where v is the speed of the object and r is the radius of its path, or a = (4π2r) / t2, where r is the radius of the object and t is the time it takes the object to travel a distance.


How to derive these equations of acceleration


Initial velocity = v1, Final velocity= v2, a = acceleration, r = radius of circular path, s = sector traveled

We follow the head-tail rule for adding vectors. Since the initial velocity points in the opposite direction as it is drawn on the circle diagram, we label it - v1. Thus getting the equation: v2-v1

a = (v2-v1) / t

a = (v2-v1) / t

at = |v2-v1| We use the absolute value of v2-v1 because we only focus on the magnitude of the velocity.

At this point we can set up a proportion: |v2-v1| / v = s / r

We substitute at for |v2-v1|, which gets us: (at) / v = s / r

(ar) / v = s / t

(ar) / v = v, s / t becomes v because we have a distance over time which gives us velocity. However, this is only when we have s as a very small value. This is because as s gets smaller, the closer it is to the curvature of the circular path.

a = v2 / r, this is an equation of centripetal acceleration with respect to velocity because the radius remains constant.

We can derive the other equation by using the equation v = d / t. The distance of a circle is 2πr. We can substitute 2πr for d, which gets us: v = (2πr) / t. With this new information we can substitute (2πr) / t for v in the equation a = v2 / r.

a = ((2πr) / t)2 / r = (4π2r) / t2

a = (4π2r) / t2, this is the equation of centripetal acceleration with respect to time because the radius remains constant.


Centripetal force


The acceleration is usually considered to be due to an inward acting force, which is known as the centripetal force. Centripetal force means “center seeking” force. It is the force that keeps an object in its uniform circular motion. We determine this force by using Newton's second law of motion, Fnet = ma, where Fnet is the net force acting on the object (this is the centripetal force, Fc, of an object in uniform circular motion), m is the mass of the object, and a is the acceleration of the object. Since the acceleration of the object in uniform circular motion is the centripetal acceleration, we can substitute v2 / r or (4π2r) / t2 for a. This gets us Fc = (mv2) / r or Fc = (4mπ2r) / t2

The centripetal force can be provided by many different things, such as tension (as in a string), and friction (as between a tire and the road).

An example of tension being the centripetal force is tying a mass onto a string and spinning it around in a horizontal circle above your head. The tension force is the centripetal force because it is the only force keeping the object in uniform circular motion.

The m is the mass of the object, and the tension force is the centripetal force because it is keeping the object in uniform circular motion.

If a person were to cut the rope at one given point. The object would continue to move in the direction of the velocity.

As one can see, the string holding mass m is cut about ¾ of the way. After the string is cut, the tension force/centripetal force is no longer acting upon the object so there is no force holding the object in uniform circular motion. Therefore it continues going in the direction when it was last in contact with the force.

Similar to the tension force, the friction force between the tires of a car and the road is the centripetal force because it keeps the car moving in a circular path. If this were a frictionless plane, the car would not be able to move in uniform circular motion, and will instead travel in a straight line. Without the friction force acting upon it, no force is keeping the car in uniform circular, so it moves in a straight line.

Answer 5

It is caused by a constant force acting on the body performing the circular motion.
This force will always be directed towards the same point, the centre of the circle and will be perpendicular to the motion at any time (the velocity is the tangent to the circumference and the force (and acceleration) will be in the direction of the radius at that point.

The fact that the speed and the force are always perpendicular prevents any gain in speed and uniform circular motion is conserved.

Answer 6

Circular motion is initiated by applying a tangential force - in the direction of the tangent to the circle of motion.
If the uniform speed is v and radius of rotation is r, the force acting on the rotating body of mass m = mv^2/r.

Answer 7

well i must agree with mohammed k.

for any body to perform a orbitary it requires two forces...A tangential force(not reqd .if the object is initially in motion)...and a centripetal force(must be proportional to the velocity of the body at any given instant )
if this centipetal force is proportional to the square of the velocity that the perodic motion will b a circular ...

Answer 8

the important hint is "uniform around action". meaning the object strikes at consistent velocity. unlike what count quantity sort Uglino printed, meaning there's no longer any tangential rigidity. the only rigidity is play is the only that forces the object to regulate course. think of of roughly spinning a newborn via using the palms. In what course is the rigidity required to maintain the toddler spinning? it somewhat is your answer.

Answer 9

A constant force toward a center point at a fixed distance.

Answer 10

simply it is a force that is always Perpendicular to the moving body, this force has a constant magnitude but changes direction