Velocity and acceleration both use speed as a starting point in their measurements. Speed, which is the measurement of distance traveled over a period of time, is a scalar quantity. Both velocity and acceleration are vector quantities, meaning that they use both magnitudes and a specified direction. As you can see, velocity requires speed for its measurement, and acceleration requires velocity for its measurement. You can measure velocity in the following units:. Pressing your foot to the gas pedal makes your car accelerate.
The time rate of change of displacement of a body is its velocity. The velocity of a body tells us how fast a body is moving in a particular direction.
Therefore, velocity is a vector quantity because there requires magnitude as well as direction for its complete description. If a body covers equal displacement in equal intervals of time, we can say that it is moving with uniform velocity. Graph of uniform velocity gives us a straight line. If a body covers unequal displacement in equal intervals of time, it has variable velocity. We can calculate the velocity of an object by using the following formula;.
If a man walks m in East in seconds, find out its velocity? After getting an idea about speed and velocity, we can compare these two quantities. Here, we will describe the difference between speed and velocity. The first difference between speed and velocity is in their meanings. The meaning of speed is the distance covered by a body in unit time.
On the other hand, the meaning of velocity is the displacement covered by a body in unit time. Speed of a body tells us how fast a body is moving. On the other hand, the velocity of a body tells us how fast and in which direction a body is moving. Velocity is a vector quantity because there requires magnitude as well as direction for its complete description. Speed of an object is always positive. On the other hand, the velocity of an object can be positive or negative.
On the other hand, we can change the direction of the velocity of a body. The magnitude of the velocity of a body can be zero, positive or negative.
On the other hand, the magnitude of the speed of a body is always positive. In other words, the magnitude of the speed of a body can never negative or zero. We can also inter-relate speed and velocity. After inter-relating speed and velocity, we know that the speed of a body may or may not be equal to its velocity. On the other hand, an object may possess different velocities but its speed remains the same. To measure both speed and velocity, we use the same unit. Speed and velocity have different equations.
This equation gives us the average velocity of a body. We use two different techniques to calculate the speed and velocity of a body. To calculate the velocity of a body, we divide displacement over time. A vector quantity is the measure of a quantity which is two-dimensional, i. A unit of measurement is the definite magnitude of a quantity. All measurements and their expression of the units are followed based on the International System of Units.
There are seven basic units. They are as follows: S. Consider a body is moving from its rest position O. It travels a distance of x and stops at a point P. The distance between point O and point P is measured as x. Thus, the change of position of a body is known as displacement. The displacement of an object is defined as the vector difference between the starting point to the ending point of a displaced object.
Displacement is not to be necessarily the same as distance travelled every time. The rate of change of displacement is velocity. When an object is moving in a specific direction with respect to time is said to be velocity, i. The velocity of an object can be changed by changing the speed, direction or both of that object. In other words, it is defined as the displacement produced per unit time.
It is calculated as the difference between the positions.
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