Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

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Which of the following best describes 'velocity'?

Rate at which an object changes its position with time
Speed in a specific direction
Both speed and direction of an object's movement
Distance over time

The correct answer is: Both speed and direction of an object's movement

Velocity is defined as both the speed of an object and the direction in which it is moving. This distinction is essential in physics, as velocity is a vector quantity, meaning it has both magnitude (how fast something is moving, which is its speed) and direction (where it is going). For example, if a car is traveling at 60 kilometers per hour to the north, its velocity is 60 kilometers per hour north. This concept is vital because it allows for a fuller understanding of motion, as simply knowing the speed provides incomplete information about how an object is moving. The other definitions provided do not encompass the full definition of velocity; they might describe either aspect of it but do not capture the complete picture of both the speed and the directional component that defines velocity in physics.