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# Which direction is always positive for centripetal acceleration and centripetal force?

Which direction is always positive for centripetal acceleration and centripetal force? Centripetal acceleration is always directed toward the center of the circle of motion. It is this centripetal acceleration that is responsible for the change in the direction of the velocity; the magnitude of the velocity remains constant.

## What happens to centripetal force if the mass doubles?

An object has a mass M, velocity V, and moves in a circle with radius R. What happens to the centripetal acceleration on the object when the mass is doubled? Possible Answers: … The centripetal acceleration is halved.

## Why is centripetal acceleration always negative?

a=-v^2/r (with the minus sign in) comes from the idea that you are measuring r to be a direction not a distance. r is measured outwards away from the centre and so the centripetal acceleration is in the opposite direction – hence the minus sign.

## Is centripetal force real?

With this definition, centripetal force would be real and centrifugal not real. Centripetal force is the force needed to make something move in a circle. … A constant magnitude centripetal force that is always perpendicular to the direction of motion will make the object move in a circle.

## What is the source of centripetal force?

The source of centripetal force is the gravitational force between the planet and Sun. Gravitational force depends on the mass of the planet, mass of the Sun and distance between them.

## Is gravity a centripetal force?

In the special case of circular orbits only, gravity is a centripetal force. Otherwise more generally, gravity is what is called a « central force ».

## What happens to the centripetal force as the speed increases?

Mass, velocity, and radius are all related when you calculate centripetal force. The equation shows that if you increase mass or speed, you’ll need a larger force; if you decrease the radius, you’re dividing by a smaller number, so you’ll also need a larger force. …

## What is centripetal force example?

A force acting on a moving body at an angle to the direction of motion, tending to make the body follow a circular or curved path. The force of gravity acting on a satellite in orbit is an example of a centripetal force; the friction of the tires of a car making a turn similarly provides centripetal force on the car.

## What is difference between centripetal and centrifugal force?

Centripetal force is defined as, « the force that is necessary to keep an object moving in a curved path and that is directed inward toward the center of rotation, » while centrifugal force is defined as « the apparent force that is felt by an object moving in a curved path that acts outwardly away from the center of …

## Why is centrifugal force fake?

Centrifugal force is an outward force apparent in a rotating reference frame. It does not exist when a system is described relative to an inertial frame of reference. … When this choice is made, fictitious forces, including the centrifugal force, arise.

## What is centripetal force in simple words?

: the force that is necessary to keep an object moving in a curved path and that is directed inward toward the center of rotation a string on the end of which a stone is whirled about exerts centripetal force on the stone — compare centrifugal force.

## Is gravity centripetal force?

When a satellite is in orbit around a planet, gravity is considered to be a centripetal force even though in the case of eccentric orbits, the gravitational force is directed towards the focus, and not towards the instantaneous center of curvature.

## What is the source of force?

Forces can be described as a push or pull on an object. … They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate.

## What is the source of gravitation?

Earth’s gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body. That’s what gives you weight. And if you were on a planet with less mass than Earth, you would weigh less than you do here.

## Can we create artificial gravity?

Artificial gravity can be created using a centripetal force. … In the context of a rotating space station it is the normal force provided by the spacecraft’s hull that acts as centripetal force.

## How is centripetal force related to speed?

As the centripetal force acts upon an object moving in a circle at constant speed, the force always acts inward as the velocity of the object is directed tangent to the circle. … In fact, whenever the unbalanced centripetal force acts perpendicular to the direction of motion, the speed of the object will remain constant.

## Where is centripetal force the greatest?

Circular Motion in “Vertical” Circles

tension is greatest at the bottom of the circular path. This is where the rope is most likely to break. It should make sense that the tension at the bottom is the greatest.

## What is centrifugal force in simple words?

: the apparent force that is felt by an object moving in a curved path that acts outwardly away from the center of rotation — compare centripetal force.

## How is centripetal force used in everyday life?

Centripetal force is the force that acts on an object in order to direct it towards a center of curvature. Imagine swinging a yo-yo around in a circle. The force generated by your arm puts the yo-yo itself in motion, and the tension on the string keeps it moving in a circular path as you twirl it.

## What happens if centripetal force is absent?

Without a net centripetal force, an object cannot travel in circular motion. In fact, if the forces are balanced, then an object in motion continues in motion in a straight line at constant speed. … The ball on the other hand will continue to move in the same direction since there is no unbalanced force acting upon it.

## Where is centrifugal force used?

The concept of centrifugal force can be applied in rotating devices, such as centrifuges, centrifugal pumps, centrifugal governors, and centrifugal clutches, and in centrifugal railways, planetary orbits and banked curves, when they are analyzed in a rotating coordinate system.

## How is centripetal force used in everyday life?

As a car makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion. As a bucket of water is tied to a string and spun in a circle, the tension force acting upon the bucket provides the centripetal force required for circular motion.

## What is the opposite of centripetal force?

Centrifugal force is the apparent outward force on a mass when it is rotated. … (Centripetal force is the necessary inward force that keeps the mass from moving in a straight line; it is the same size as centrifugal force, with the opposite sign. Centripetal force is real; centrifugal force is just an apparent force.

## What’s the difference between centripetal and centrifugal force?

Centripetal force is the force REQUIRED for circular motion. Centrifugal force is the force that makes something flee from the center.

## What is another name for centripetal force?

The centripetal force can also be supplied as a ‘push’ force, such as in the case where the normal reaction of a wall supplies the centripetal force for a wall of death rider. Newton’s idea of a centripetal force corresponds to what is nowadays referred to as a central force.