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2011-02-18 11:51:57
2011-02-18 11:51:57

same speed

, coz velocity is constant

velocity consists of speed and direction...

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an acceleration of Zero, and a constant Inertia.



Velocity includes both speed and direction, so velocity will change when an object changes direction while maintaining it's speed. An example is a car at constant speed around a curve.


2 Forces are unbalanced when an object that is not moving starts moving or changes speed or direction. Balanced forces are the opposite they are where an object that is not moving stays still or an object that is moving stays at a constant pace.


That depends on the situation. If the object is moving freely in a vacuum, the speed stays the same. If an object is accelerating, the speed change depends in part, on the mass of the object.


For an object's speed to change (increase or decrease), the object must be accelerating. If there is an acceleration, there is a non-zero net force acting on the object.note: Velocity and speed are different. An object's velocity can change without the speed changing. Example of this is centripetal acceleration. The object's velocity changes directions, thus the velocity changes. The magnitude (or speed), however, stays the same (if only a radial acceleration is present).




Zero net force on a object means that the velocity of the object stays constant (this includes 0, when the object is not moving). Lets look at Newton's 2nd law of motion: Fnet=ma An object can never have a 0 mass (then it wouldn't exist). Therefore, the acceleration has to be 0 for the net force to be zero. Recall at acceleration is the change of velocity over time. In order for the acceleration to be zero, the velocity has to be constant. If the object is at 0 velocity (not moving), the object would remain unmoving when a net force of 0 is applied to it. If the object is moving at a certain velocity, it would remain at that velocity. Therefore, a zero not force cannot do anything to an object.


Newton's first law states that an object at rest stays at rest and an object in motion stays in motion with constant velocity unless acted upon by an unbalanced force. This is also called the law of inertia. So, the forces acting on an object are balanced when the object is not accelerating. This happens when the object is at rest, or when the object is moving at constant velocity. ===================== The forces on an object are balanced when their vector sum is zero.



You have three separate situations here:1. Object stays at rest. The force on the object is not great enough to overcome its frictional forces, or its inertia.2. Object keeps moving at constant velocity. The object's inertia and frictional forces are exactly balancedby the Force exerted on it.3. Object moves with increasing velocity (acceleration). The Force on the object exceeds that necessary to overcome its inertia and its frictional forces.


Height only affects Speed if the object is moving through a medium OTHER than a Vacuum. FRONTAL AREA of the object causes resistance to the forward motion. The 'thicker' the medium the more the resistance. I.E., Water resistance is greater than Air resistance. So, if the WIDTH of the object is constant, then the increase in Height increases the Frontal Area and increases the resistance to forward motion. Furthermore if the Force moving the object stays the same, then its Velocity will be LOWER.


because it wont be as heavy when it stays having the same velocity


When an object is moving it stays moving unless acted upon by opposing force(s). i.e. gravity, friction, etc. See Newton's 1st law of motion: related links.


Terminal. It stays at that one velocity til the object hits the ground.



Acceleration is a change in velocity with respect to time. Velocity is a vector quantity, meaning it has both a direction and a speed. Acceleration is therefore also a vector quantity. So if you change the direction an object is moving without changing its speed, you are still accelerating the object.The best example of this is circular motion. If you tie a string to a rock and swing around your head at a steady rate, the speed of the rock stays the same but its direction is continually changing. It is accelerating, and the acceleration vector points directly to the center of rotation.



no net force on it and it keeps travellind with constant velocity or stays without moving.




momentum = mass * velocity As the momentum changes with constant mass, the velocity cahnges.


It cannot go any faster. It's acceleration drops to 0 and the velocity stays constant.


"The velocity of a body stays constant unless acted upon by an external force." Basically, it takes outside force to speed something up, slow it down, start it moving, and stop it moving.



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