# What keeps a ball on a string moving in a circle?

## What forces act on a ball on a string?

There are two forces acting on the ball: tension from the string and force due to gravitation. They cancel each other.

## Can you actually swing a ball in a horizontal circle with a perfectly horizontal string?

In a situation wherein the ball is completely horizontal, the downward gravitational force acting on the ball would be unbalanced and it would cause the ball to dip downwards. This would cause the string to slant upwards towards the person spinning the ball.

## What is the tension in the string when the ball is at the top?

1. A ball of mass M attached to a string of length L moves in a circle in a vertical plane as shown above. At the top of the circular path, the tension in the string is twice the weight of the ball.

## What will happen to the ball tied to a string and whirled in a horizontal circle if the string breaks?

This is Expert Verified Answer When that (string) force is removed, the object will move in a straight line with whatever velocity it happened to have when the force was removed. So when the string breaks, the ball will move in a straight line.

## Which law of motion describe the motion of the ball before and after the string snap?

Newton’s First Law of Motion.

## What causes centripetal force?

Centripetal forces cause centripetal accelerations. In the special case of the Earth’s circular motion around the Sun – or any satellite’s circular motion around any celestial body – the centripetal force causing the motion is the result of the gravitational attraction between them.

## What causes centrifugal force?

When you swing an object around on a string or rope, the object will pull outward on the rope. The force you feel is called the centrifugal force and is caused by the inertia of the object, where it seeks to follow a straight-line path.

## What happens to the ball you are rotating around in a string the string breaks?

If the string breaks, the ball flies off in a straight- line path in the direction it was traveling at the instant the string broke. If the string is no longer applying a force to the ball, Newton’s First Law tells us that the ball will continue to move in a straight line.

## Why is it impossible to swing the moving mass in a perfectly horizontal circle?

On earth, the downward force of gravity can only be balanced if the tension has some upward component. If you tried to swing the ball horizontally around your head, there would be no upward component to tension, so gravity would provide a net force downward, and the ball would begin to fall.

## Why is it impossible to have the string be perfectly horizontal?

The tension is not perfectly horizontal, it’s actually pointing slightly upwards. You certainly couldn’t spin an object in a perfect horizontal string, because in such a string the tension would only pull the object horizontally and the unbalanced gravitational force would cause downward motion.

## How do you find the tension in a swinging rope?

We can think of a tension in a given rope as T = (m × g) + (m × a), where “g” is the acceleration due to gravity of any objects the rope is supporting and “a” is any other acceleration on any objects the rope is supporting.

## Why is tension highest at the bottom?

Tension and gravity are NOT “in the same direction”. The tension in the rope is always directed toward the middle of the circle. At the bottom, that means tension is UPWARD while gravitational force is directed DOWNWARD. The two are in opposite directions, not the same direction.

## What happened to the ball when the string breaks and is no longer holding onto the ball?

But when the string breaks, this centripetal force is no longer there and due to its inertia the ball shoots of tangentially due to its inertia.

## When a ball is whirled in a circle and the string supporting the ball is released?

Explanation: Newton’s 1st Law says that an object at rest tends to stay at rest and an object in motion tends to continue to move in a straight line unless acted on by an outside force. The property of mass that causes this behavior is called inertia.

## Why the stone moves away when the string is broken during rotation?

When a stone is going around a circular path, the instantaneous velocity of stone is acting as tangent to the circle. When the string breaks, the centripetal force stops to act. Due to inertia, the stone continues to move along the tangent to circular path. So, the stone flies off tangentially to the circular path.

## Which string breaks first in physics?

If you are accelerating down much less than the acceleration due to gravity, the tension on the bottom string is much less than the tension of the top string*. Because the tension is greater at the top, that string will break first.

## What does Newton’s 2nd law of motion State?

His second law defines a force to be equal to change in momentum (mass times velocity) per change in time. Momentum is defined to be the mass m of an object times its velocity V.

## What is an example of Newton’s first law?

The motion of a ball falling down through the atmosphere, or a model rocket being launched up into the atmosphere are both examples of Newton’s first law. The motion of a kite when the wind changes can also be described by the first law.

## How does Newton’s 2nd law apply to circular motion?

According to Newton’s second law of motion, a net force causes the acceleration of mass according to Fnet = ma. For uniform circular motion, the acceleration is centripetal acceleration: a = ac. Therefore, the magnitude of centripetal force, Fc, is F c = m a c F c = m a c .