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Answered 2013-08-04 22:07:42

No. Acceleration is any change of velocity.

But its speed can be constant.

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A moving object being accelerated will show a change in its velocity (it may move faster, or slower, or experience a change in direction). A stationary object will respond to acceleration only if there is no other force acting to prevent its response. For example: gravity is a constant force of acceleration, but objects cannot move toward the center of the earth if they are being blocked by another object.

If the distance is not changing, the object is not moving. If the distance is increasing or decreasing linearly then the object is moving at a constant velocity. If the distance is increasing or decreasing parabolically then the object is being accelerated or decellerated.

Yes. The simplest such case is when the object is moving along a circle.

In Simple motion, there is no force being applied. The moving object moves in a straight line with constant velocity. In acceleration, there is a force applied. The object's velocity is changing. The first derivative of acceleration is velocity. The first derivative of velocity is distance. (Derivative is a calculus thing.)

if moving with constant velocity the only force to slow it down is kinetic friction; if it is accelerating velocity is not constant and an additional force is being applied.

An example of an object being accelerated even though its speed remains constant is a car traveling down a hill. Even if the driver maintains constant pressure, the car will accelerate due to the incline of the hill.

A ferris wheel turning at a constant speed has no change in speed. But velocity is speed with a direction vector attached to it. Speed with a direction component is velocity. In this case, the distance per unit of time (speed) that something is traveling is constant, but the direction it is traveling is constantly changing because that something is moving in an arc (or circle). It's a ferris wheel, and anything on it has its velocity changing. Velocity is changing every second because the direction it is moving is changing. Any change in the velocity of an object will require that the object be accelerated. Even if its speed is constant, it will experience acceleration to change "just" the direction it is traveling. It's the same with an object in orbit. The object will be cruising along at a constant speed, but its velocity will be constantly changing. This is because the direction the object is moving is changing because it is being accelerated constantly to get it to move in an arc. The object was put in orbit, and it was accelerated into that orbit. Now, the object is being acted on constantly by gravity. The gravity is pulling the object back to earth, but if we look at where it is going at any instant of time, it is moving on a tangent to its path of travel. It moves a tiny bit on that tangent, and gravity pulls it "in" just a tiny bit, and that makes it path an arc. A little on the tangent, and a little "in" toward earth. A little more on the "new" tangent path, and a little "in" toward earth. A little more along the new tangent path, and a little more in toward earth. A smooth arc - a circle. The object in orbit is constantly being accelerated toward earth, and this acceleration constantly changes its velocity (but not its speed), and it moves in that circular orbit.

the force is the mass of the object times its acceleration. If it is moving at constant velocity (no acceleration) there is no net force..

The net force must be zero otherwise the object would experience acceleration and thus not constant motion.

velocity is the first derivative of motion, with acceleration being the second; if an object has a constant velocity, then it's acceleration is 0. This is easy to see from everyday life, when you are in a car, you only feel it jerk when you are accelerating but once you've reached your speed you feel nothing.

The rate of acceleration is a measure of the change of the velocity of an object with time. On a graph of velocity versus time, it is represented by the slope of the line so graphed. If velocity is changing in time, the object described is being accelerated. The greater the slope of the graph, the greater the change of velocity per unit of time and the greater the acceleration of that object. true

Absolutely. It happens all the time, and in many more places than you might think. First we need to look at how we think about acceleration. If we consider that a change in vector is also a change in speed, or velocity, then any object that is constantly changing it's vector in angular momentum is under acceleration but does not change its actual speed, just direction. So then every star, and every planet, in motion is under constant acceleration and at the same time maintains the same velocity, or speed. Another thing to consider is Einstein's Theory of General Relativity which says that an object under the influence of gravity, but stationary, like us standing on the surface of the Earth, is very much the same as the same object that is being accelerated by the same force of gravity, or G-force. So that means as you are standing on the ground, you are actually being 'accelerated' towards the center of the Earth, even though you are maintaining a constant velocity, or speed.

Acceleration is defined as the change in velocity over a given time period. Velocity is a vector quantity: it includes speed and direction. That being said, you can accelerate an object without changing its speed by simply changing its direction. A body moving along the circumference of a circle its speed may remain a constant, but its velocity will not be a constant since its direction of motion continuously changes, since the velocity changes it has an acceleration.

Only instantaneously. If an object is being negatively accelerated, it will be slowing down. If the negative acceleration continues to act on the body, it may, at some point have zero velocity because it has come to a stop, but still have the force acting on it. In the next instant, the object will then be accelerated in another direction. This isn't a "trick" answer. It is just offered to explain a situation in mechanics where an object with some initial velocity is experiencing negative acceleration due to some decelerating force. The dynamics are pretty simple and easy to get your head around if you think about them.

Yes, an object can have have zero velocity and non-zero acceleration. This happens when an object is at rest and when a force is applied on it such as gravity. But this isn't always true. A good example of another situation is when you throw an object vertically up into the air. Such an object will be acted upon by the constant acceleration of gravity. Due to this acceleration, it will slow down, then it will reverse direction, and finally it will fall back to the ground. At the exact point at the top of its path before falling back down, the object will have zero velocity. Yet it will still be accelerating towards the ground the whole time. The object is being accelerated by the force of gravity throughout its entire journey.

It's a bit more of a vexed question if you are considering a human body rather than an inanimate object. To lift the box requires work. An object moving at constant velocity is not being worked upon. However, you are still performing work when you move your muscles.

Velocity is the measure of increasing and decreasing speed. For example... on a velocity graph, if the object being measured is gradually getting faster the line will go up. If it is getting slower, it will go down, if it is staying at a constant speed, the line will be straight

Please slow down. A few points need to be clarified here: -- There's no such thing as "moving with constant force". -- If the object exerts a force on something else, or a constant force acts on the object, then the object can't move with constant velocity. It must accelerate. -- A moving object has energy, but it doesn't have 'power'. Power is the rate at which energy is moving, or changing, or being used. If the object is moving with constant velocity, then its energy is not changing. -- If its energy is changing, then its velocity, or position, or temperature is changing. Either the object is transferring energy to something else (like brakes), or something else is transferring energy to the object (like an engine). Either way, the rate at which power is exchanging between the object and something else is the power. But there's no such thing as "power of the object". Now, what was it you were saying ? The energy of the object can be calculated, if we either know or measure its mass, electric charge, altitude, speed, temperature, etc.

An object has a constant velocity when it is not being acted upon by a force (or an unbalanced force) (zero is still a velocity). It is essentially impossible to have a pure constant velocity on earth because of gravity, friction, air resistance, and the rotation of the planet, the orbit of the planet around the sun, and the orbit of the sun around the Milky Way. However, in a single reference plane (the surface of the earth), one may be able to approach it as long as forces are balanced. Even in space, there are forces of gravity and rotational momentum that must be considered.

The speed and direction of an object combine to give its velocity with the speed being equal to the magnitude of the velocity.

Because being in equilibrium only requires that no force is moving on an object. It can be moving, but must have no acceleration in any direction. It can be thought that it was not in equilibrium while it was brought to its current speed, but once it stopped being accelerated it is once again in equilibrium.

The motion of an object will change when a force is applied to it. Newtons laws of motion descibe this. An object without any force being aplied to it will remain at constant velocity. Wether that be at a constant 0 m/s or a constant 12m/s or 300 m/s and so on. The motion of that object will change when a force is applied to it by causing an increase in acceleration in the direction of the force being applied. -look up Newtons Laws of motion for more detail.

It can have a constant speed, and a changing velocity, but it cannot have the two at the same time. Remember: Velocity = speed with a directional component.

If you exert a force on an object in motion you will change its velocity, velocity being a vector quantity of speed and direction.

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