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2009-03-14 18:12:08
2009-03-14 18:12:08

Changing the magnitude or direction of forces exerted on an object changes the net force (sum of all forces) exerted on the object. The net force exerted on an object is defined as mass times acceleration (F = ma), where mass, m, is constant. This means that when the net force exerted on the object changes in magnitude (or direction), its acceleration will also change in magnitude (or direction). In addition, acceleration is defined as the change in velocity, so when the magnitude (or direction) of acceleration changes, the magnitude (or direction) of velocity will also change.


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Acceleration is a change in velocity. More precisely, to get acceleration, you divide the change in velocity, by the time that passed.Acceleration is a change in velocity. More precisely, to get acceleration, you divide the change in velocity, by the time that passed.Acceleration is a change in velocity. More precisely, to get acceleration, you divide the change in velocity, by the time that passed.Acceleration is a change in velocity. More precisely, to get acceleration, you divide the change in velocity, by the time that passed.

Acceleration simply refers to the rate of change of a velocity. You might say that the effect of an acceleration - any acceleration - is therefore a change of velocity.

A force, applied to an object, will cause an acceleration, that is, a change in velocity. This may be an increase or a decrease in speed, or a change of direction.

Acceleration is the term meaning any change in an object's speed or direction.

Either a change in speed or direction, or both, will affect its velocity. If there is a change in speed, then the rover's velocity has changed.

The magnitude of the velocity increases at a steady rate, but its direction remains constant, pointing toward the center of the Earth. (Wherever the event is taking place, the locals refer to that direction as "down".) Since either the magnitude or the direction of the velocity is changing, the effect can properly be called "acceleration".

doing some homework? A net force vector/imbalance can either increase velocity (positive acceleration), decrease velocity (negative acceleration) or effect zero acceleration (perpendicular).

If you are decreasing velocity, you are undergoing negative acceleration.

Well, (final velocity) = (initial velocity) + (acceleration x time)

Mass by itself has no effect on velocity. In terminal velocity (velocity of an object falling through a fluid) the mass tovolume ratio (density) can change the final velocity at any given medium density, but in acceleration in a vacuum there is no impact from mass on velocity.

There are two problems with this question.The less obvious one is: What do you mean by "a negative effect" on velocity ?ANY force that acts in the direction opposite to the direction of the velocity willcause the magnitude of velocity to decrease, which in itself is pretty negative.If the force continues to act long enough, it will eventually cause the velocityto reverse its direction, which is about the most negative effect you can haveon velocity.

The footballer runs with the ball in a straight line ( His speed). He then has to change direction because another footballer trys to block him so he changes direction (Velocity) i.e a change in direction. Velocity is speed with a direction. Say 5 mph in a NE direction. Answer The above answer is correct. Soccer is all about velocity. Rarely do you see a footballer run for long in a straight line. He uses the field in every direction to reach his goal, well the opposites sides goal.

No. Acceleration may point in any direction at all with respect to the direction of motion.Acceleration in the direction of motion increases the speed in the same direction.Acceleration in the opposite direction leads to an effect commonly referred to as "slowing down".Acceleration in any other random direction bends the path of the motion, and may increase or decrease the speed.

Negative acceleration means the moving body is slowing down.

Its speed of motion, or its direction of motion, or both, would change. In general, the change would be described as 'acceleration'.

Acceleration is the change in speed or direction. When the ball strikes a wall it will likely rebound. That is a change in direction. Some of the energy of the ball went into heat and sound so, that is also a change in speed. The only wall that would have no effect on the ball's acceleration would be a wall of light or an imaginary wall.

A mirror has no effect on the speed of light, but it has a radical effect on thevelocity of the wavefront, because it reverses the direction of the normalcomponent of the velocity.

Force (newtons) = mass (kg) * acceleration ((m/s)/s) but > acceleration in a circle = velocity 2 / radius So > (centripetal) force = mass * (velocity 2 / radius)

Acceleration is just the change of velocity per unit time, so it doesn't matter at all what the velocity is. However, if you are talking about the amount of force you need to apply to something in order to get a certain acceleration, F=ma, and m does change with velocity (only when you take relativity into account), so the faster you go, the more force you need to apply to get the same acceleration. This effect is extremely small for velocities which aren't close to the speed of light, though.

Gravity is a force and any force acting on a body changes its velocity in the direction of the force.

I don't know whether the question is asking "What happens to an accelerating object ?", or is asking "How can you tell whether the object is accelerated ?" So I'll try to address both aspects. Acceleration is defined as any change in the object's velocity vector ... magnitude, direction, or both. The magnitude of the vector is the part we usually think of when 'acceleration' is mentioned. Another word for the magnitude of the vector is the object's "speed". A change in speed is ceratainly acceleration, whether the speed is increasing or decreasing (negative acceleration). Change of speed is easily measured by observing the object's position at several points in time. The observer may be in a reference frame outside the object, or traveling with the object and measuring with respect to points in the external frame. (I'm not sure there's any difference.) But a change in speed is not a 'necessary' indication of acceleration. A change of direction is just as good. For example, consider a planet in circular orbit; or better, consider a geostationary 'TV' satellite. It's orbital 'speed' is virtually constant, yet it is in a situation of constant acceleration due to gravitation. The effect of the acceleration is the uniformly curved path. The direction of the velocity vector changes (with constant angular velocity), and the magnitude of the vector is constant. Change in the object's direction of motion may be even easier to observe from an external frame than a change in its speed. Simply get behind it and sight along its path. If the object ever departs from your line of sight, then it has acceleration.

There are many ways of looking at this question first and foremost you must state the position of your self with respect to the body. case 1 You are stationary or moving with a constant velocity. And located outside the object under consideration. In this case if the body has suffered from a change in velocity or a continued change in velocity or a change in direction or is currently changing its direction. It has undergone or is currently undergoing acceleration. case 2 You are located inside the body and the body is hollow and you are able to see what happens outside the body through a window like object or rather this case can be better explained if you imagine yourself sitting on the object while its in motion. Similarly here also change in velocity and direction can be marked although you will find the relative velocity between the two the object and you to be zero. Case 3 When you are inside the body,with no way to know how the body behaves in an external frame of reference. Also it may be noted that the body is hollow. Here whenever the body undergoes an acceleration you will sense it owing to your inertia.But if the body has undergone acceleration already and is now moving in a constant velocity there is no way of knowing the time or amount of acceleration it has undergone. Case 4 when you are inside a solid body with no way to look at an external frame of reference. Due to the nature of the body you cannot sense the effect of inertia. therefore one cannot sense whether the body is undergoing acceleration or has undergone acceleration in the past.

Gravity is a force and has the effect of changing the velocity or direction of motion of a moving object.

Balanced forces will not change the velocity - speed and direction - of a moving object. the object will continue to move in the same way.

You need to know about gravity, forces, velocity, acceleration, and vector.

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