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If you are talking about free fall, acceleration due to gravity and velocity will both be negative, until terminal velocity is reached, at which point the falling object is no longer accelerating and has constant negative velocity.

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0Acceleration is change in velocity so the direction should be the same

No. If there is a net force (if the sum of all the forces is not equal to zero), then there will be an acceleration, and the velocity will NOT be constant.

firstly, we should know what is meaning of accelerate i.e(to increase)that means acceleration is something which increases some physical quantity.In mechanics,acceleration means rate of change of velocity per unit time .a=v-u/twhere v=final velocity, u=initial velocity ,t=time& a=accelerationnow ,if the change in velocity is positive then i.e final velocity is greater than initial velocity.Suppose to be positive acceleration or simply acceleration.But when change in velocity is negative then acceleration is negative suppose to bedeceleration.Important thing is that acceleration is vector .so ,positive or negative accelerationindicates direction of acceleration.hence , force ,by Newton's second law.acceleration tends to increase the velocity of a moving body in the direction of motion while deceleration tends to decrease the velocity of the moving body applies in opposite direction of motion upto zero velocity after which it accelerate means increase velocity of the body but in opposite direction of initial direction of motion.

Acceleration is the rate of change of velocity (how fast velocity changes - dv/dt). You should also remember that acceleration is a vector, meaning that direction matters. If any objects goes around - even at a constant speed - in a curve, its direction is changing, therefore its velocity its changing, therefore it is accelerating.

There is linear acceleration which is related to motion in some given direction.a sub linear in x direction = d(v sub x) /dtThere is also angular acceleration which is related to motion following a curve, such as a circle.a sub radial = dw/dtwhere w is angular velocity in radians per second.

Probably an incorrect spelling of "acceleration", which refers to the rate of change of velocity - how fast a velocity changes. Perhaps the above answer should read speed and not velocity, as velocity means a change of direction? i.e The car accelerated from 60 kl per hr to 70 kl per hour travelling due north, then changed direction to NNW. The change in direction is a vector.

Perhaps you are thinking that the velocity should be proportional to the force, or something like that. That's not the way it works. It is the acceleration, not the velocity, that is proportional to the force, but it may take a while to change the velocity. If an object is moving in one direction and there is a force in the opposite direction, it may simply take a while for the velocity to change enough, so that it also moves in the direction of the force. For example, if you throw an object upwards, once you let it go, basically the only force acting on the object is gravity - which basically pulls it downward. Depending on the object's speed, it may take a while for the object to "turn around".

direction. A moments consideration and it should be plain to see that the direction of the velocity is constantly changing. This requires an acceleration which is given as a = v2/r

When the object is at rest, the acceleration is zero. so the net total force acting on the body from all directions should be zero. when the object is moving with constant velocity, the acceleration is zero, so in this case too, after the motion is started, the force on the body should be zero. when the velocity is increasing, some acceleration is present, so some force should be present in the direction of the motion. These are the various cases which can be explained by the equation: Force = Mass * Acceleration. here the mass remains constant, so acceleration depends on the net force

When the object is at rest, the acceleration is zero. so the net total force acting on the body from all directions should be zero. when the object is moving with constant velocity, the acceleration is zero, so in this case too, after the motion is started, the force on the body should be zero. when the velocity is increasing, some acceleration is present, so some force should be present in the direction of the motion. These are the various cases which can be explained by the equation: Force = Mass * Acceleration. here the mass remains constant, so acceleration depends on the net force/

inital velocity (u) should be less

Acceleration is characterized by a change to the velocity of a mass (ie to the speed of any object) The change can be an increase or a decrease in speed or a change in direction. The change results from the application of a force on the object. The mathematical formula is F=M*A where F is force, M is mass and A is acceleration. Note that force and acceleration are vector quantities, that is, direction should be part of the full description.

An object changing its velocity by 10 m/s in each consecutive second is known asconstant acceleration since the velocity is changing by a constant amount each second. Although an object with a constant acceleration should not be confused with an object with a constant velocity.

A horizontal line parallel to speed axis indicates that the body is moving at a constant speed i.e. it's speed doesn't change with passage of time. The body may have zero or non zero acceleration, but it will always have non zero velocity. But, that doesn't mean that body's velocity is constant and it is not accelerated. For example in uniform circular motion the speed of body remains constant but velocity changes due to change in the direction of motion. Also there is acceleration towards center of circle called centripetal acceleration which changes the direction of velocity. For this acceleration a force should act towards the center called centripetal force. If speed is constant then the force, if present, must act in direction perpendicular to the immediate direction of motion i.e. perpendicular to the tangent drawn at any point on the path of motion.

You should divide the change in velocity of the car by the time interval.

It depends how you changed the direction of the body. If the body is hit by an external force in the direction of motion, the velocity should increase. If the body is hit by an external force in the opposite direction of motion, velocity will decrease.

Velocity is speed and direction. It is important to know the velocity and not just the speed, because with both speed and direction you can figure out where a tornado is going and when it should get there.

The idea is that you should: a) Calculate the change in velocity. b) Divide this change by the time. This gives you the average acceleration over the 20 seconds, in this case.

Velocity definitely is. Time should be, but since we can't control its direction, its considered a scaler.

You should use the formula you learned for just exactly this situation.V = V0 + a tFinal speed = (initial speed) + (acceleration) x (time)

It should be noted that an acceleration is not a velocity. Velocity is defined as distance per unit rate; thus, it has dimensions of length/time. Acceleration is defined as change of velocity per unit rate; thus, its dimensions are velocity / time, i.e., (length/time) / time.

By Newton's Second Law: force = mass x acceleration, or acceleration = force / mass. Since there is a force, there should be an acceleration - a change of velocity.

A ceiling fan should blow air downward in the summer and upward in the winter.

To determine acceleration from a position vs. time graph, you must first look at the slope of the graph. The slope is the velocity. (in calculus, dx/dt). You should draw a graph of the velocity over the course of the time interval. Now, look at the slope of the velocity vs. time graph. That is the acceleration. (in calculus d2x/dt2)

Basically correct, except for the wording. It should be: "... the harder it is to change its velocity".

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