![]() ![]() Initial velocity, u = 0 m/s (because it was at rest - not moving)Ĭhange in velocity, ∆ v = (28 - 0) = 28 m/sĪ car takes 25 s to accelerate from 20 m/s to 30 m/s. Calculate the average acceleration of the car. ExampleĪ car takes 8.0 s to accelerate from rest to 28 m/s. If an object is slowing down, it is decelerating (and its acceleration has a negative value). time taken ( t ) is measured in seconds (s).change in velocity (∆ v ) is measured in metres per second (m/s).Velocity has a direction and a magnitude (speed) and is therefore considered to be a vector. acceleration ( α ) is measured in metres per second squared (m/s²) It is the rate of change in an objects position. ![]() The average acceleration of an object can be calculated using the equation: 5 If a car is said to travel at 60 km/h, its speed has been specified. The change in velocity can be calculated using the equation:Ĭhange in velocity = final velocity - initial velocity Speed denotes only how fast an object is moving, whereas velocity describes both how fast and in which direction the object is moving. Velocity is represented by the formula: Velocity the change in distance/change in time Velocity x/t How to Measure Velocity Velocity has the same unit of measure as speed. Velocity has a magnitude (speed) and a direction. It is the amount that velocity changes per unit time. Velocity is the rate of change in an object's position. the distance travelled, measured in a straight line from start to finishĪcceleration is the rate of change of velocity.Unlike distance, which is a scalar quantity, displacement is a vector quantity. To calculate velocity, displacement is used in calculations, rather than distance. Velocity is a vector quantity because it has both a magnitude and an associated direction. The velocity of an object is its speed in a particular direction.
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