What term describes a decrease in the velocity of a moving object?

What term describes a decrease in the velocity of a moving object?

• A. Deceleration
• B. Acceleration
• C. Velocity
• D. Momentum

Answer: (A)

The term that accurately describes a decrease in the velocity of a moving object is deceleration. This term specifically refers to a reduction in speed or a slowing down of an object that is already in motion. In physics, it's defined as a negative acceleration, meaning that the object's velocity is decreasing over time. Deceleration occurs when the forces acting on the object are such that they oppose its direction of motion, causing it to slow down.

Acceleration, while closely related, refers to any change in velocity, which can include increases in speed as well as decreases. Momentum is the product of an object’s mass and its velocity, and while it is affected by changes in velocity, it does not specifically describe the rate of change in speed itself. Velocity is a vector quantity that indicates both the speed and direction of an object, but it does not inherently convey information about whether the object is speeding up or slowing down. Thus, deceleration is the precise term needed to describe a situation where the velocity of a moving object is decreasing.