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.

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