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Answered 2009-09-23 05:10:29

If the speed of an object is cited and its direction of motion is also cited, we have the velocity of the object. Velocity is speed plus a direction vector.

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This is one definition of acceleration (including deceleration) - any change in the speed of motion of a moving object, or in the direction of its motion. Motion is a vector value with both speed and direction.


Velocity is defined as the rate of change of the position of an object in relation to the specification of its speed and direction of motion. Therefore, an object at rest will have zero velocity.


The definition of rate of rate of change of velocity is Velocity is the rate of change of the position of an object, equivalent to a specification of its speed and direction of motion, e.g. 60 km/h to the north. Velocity is an important concept in kinematics, the branch of classical mechanics which describes the motion of bodies.


The direction of the force of friction is such that it opposes the direction of motion that an object would move if there were no frictional force acting on the object.


When a moving object is pushed in the direction of its motion the speed of the object increases


Friction always acts in a direction opposing the motion of an object.


The speed increases. The object accellerates positively in the direction of motion.


The direction of the frictional force on a moving object is opposite the direction of motion.


it is speed of motion and direction of motion


when an object changes its motion it is because a new force that is greater than the original force has been applied to the object and that object changes its motion unless the force is in the same direction as the original force, which would then imply that the object stays in the same direction of motion, but moves at a greater speed in that direction.


If an object is in motion it has a Velocity, which is speed and direction.



The exertion of a force on an object that produces motion in the direction of a force is called work.


By using an Arrow (VECTOR) to represent its SPEED and DIRECTION. Where the Arrow points is its Direction of Motion, and its LENGTH (magnitude) is its SPEED.


force applied to an object as a pulling motion towards a fixed or an object in equal motion with the object.


1). Force applied to a moving object, in the direction of its motion. Speed increases, direction remains unchanged. 2). Force applied to a moving object, opposite to the direction of its motion. Speed decreases, direction remains unchanged. 3). Force applied to a moving object, in an arbitrary direction not parallel to the direction of motion. Speed and direction both change. 4). (bonus): Force applied to a moving object, force is kept exactly perpendicular to the direction of motion at every instant. Speed remains constant, path of the motion becomes circular.


Observe that the object below moves in the negativedirection with a changing velocity. An object which moves in the negative direction has a negative velocity. If the object is speeding up then its acceleration vector is directed in the same direction as its motion (in this case, a negative acceleration).


Inertia is the tendency of an object that is at rest to stay at rest or an object that is in motion to continue that motion.


I think this question is not phrased very well. Any force can change objects velocity (speed+direction). If fact that is the definition of the force - F=ma any force, by definition itself, can change objects velocity. Maybe you meant what force can change objects direction of motion? In that case - any force that has a different direction (not the same as direction of motion) Any force can change an object's motion.


When an object accelerates it can change its speed or direction of motion. When it accelerates without changing its direction of motion, it can cover any distance in less time.


Acceleration is defined as the change in velocity divided by the time ora = (vf - vi)/tVelocity measures the speed and the direction of an object.In uniform circular motion, the object has the same speed but it is always changing direction and so, by the definition of acceleration, the object is considered accelerating. If this acceleration doesn't exist, the object would move in a straight line according to Newton's laws of motion.


A force can cause an object to change its speed if it has a component along the same direction with its speed. It can change its direction if it has a component in a different direction from the direction of its speed. so if a force is 1) parallel to the direction of speed and motion it only changes the speed. 2)If it makes an angle different than 90 degrees with the direction of motion it changes both direction and speed 3) if it is perpendicular(90 degrees) to the direction of motion it only changes the direction of motion and causes the object to make circular motion


Friction force works against the motion of the object. In other words friction force has the opponent direction of the velocity of the object.



If an object is falling through a gas or liquid, then the drag force and buoyancy forces will act in the opposite direction to the motion of the falling object.



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